Somewhat confirmed. `file' detects some of them. This is an issue in the pattern for mp3s in shared-mime-info, but not all of them would be detectable. Tried it with my independent mime utility which goes with the content patterns.

With file:
[5:20:41] adys@azura ~/tmp % file *
02_Fog:                                                      MPEG ADTS, layer III, v1, 320 kbps, 44.1 kHz, JntStereo
Above_The_Clouds:                                            MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
Above_the_Clouds_(Remix):                                    MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
Animal_Kingdom_-_Can_You_Feel_the_Love_Tonight:              data
Chaikovsky_like_ver_-_Can_You_Feel_The_Love_Tonight:         MPEG ADTS, layer III, v1, 112 kbps, 44.1 kHz, JntStereo
Club_Mix_-_Can_You_Feel_The_Love_Tonight:                    MPEG ADTS, layer III, v1, 112 kbps, 44.1 kHz, JntStereo
Cougar_boulevard:                                            MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
Deep_Blue:                                                   MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
DownMix_-_Can_You_Feel_The_Love_Tonight:                     MPEG ADTS, layer III, v1, 112 kbps, 44.1 kHz, JntStereo
Ensemble_Pro_Brass_-_Can_you_feel_the_love_tonight:          data
Gleb_Moiseev_-_Can_You_Feel_The_Love_Tonight:                MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
GTA San Andreas:                                             MPEG ADTS, layer III, v1, 192 kbps, 44.1 kHz, JntStereo
Instrumental_Elton_John_ver_-_Can_You_Feel_The_Love_Tonight: MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
Instrumental_Symphonic_ver_-_Can_You_Feel_The_Love_Tonight:  MPEG ADTS, layer III, v1, 112 kbps, 44.1 kHz, JntStereo
In the dark:                                                 data
Lights:                                                      data
MartinWolf_-_Can_You_Feel_the_Love_Tonigh:                   MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
NATURE:                                                      data
Nu_Love_-_Can_You_Feel_The_Love_Tonight:                     data
Pattern 31:                                                  MPEG ADTS, layer III, v1, 160 kbps, 44.1 kHz, JntStereo
Pine_Pipe_Instrumental_ver_-_Can_You_Feel_The_Love_Tonight:  MPEG ADTS, layer III, v1, 112 kbps, 44.1 kHz, JntStereo
Pride Lands:                                                 data
skybowl_-_Lunar_a_Code_III__Variation_1:                     data
Skybowl - This Land (demo):                                  data
Skybowl - Upendi:                                            data
Skybowl - We are one:                                        data
something:                                                   data
Star_Academy_3_-_Can_You_Feel_the_Love_Tonight:              data
Sunnyday:                                                    data
Timon_&_Pumbaa_-_Can_You_Feel_The_Love_Tonight:              MPEG ADTS, layer III, v2,  56 kbps, 22.05 kHz, JntStereo
Toon_ver_-_Can_You_Feel_The_Love_Tonight:                    MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
Track 4:                                                     data
var2:                                                        data
var3:                                                        data
Weekend_Drive:                                               MPEG ADTS, layer III, v1, 128 kbps, 44.1 kHz, JntStereo
William_Hung_-_Can_You_Feel_the_Love_Tonight:                MPEG ADTS, layer III, v1, 224 kbps, 44.1 kHz, JntStereo
Пурикусвадосия-2:                                            data

With my utility:
[5:20:43] adys@azura ~/tmp % mime *
Above_the_Clouds_(Remix)                                      application/octet-stream
Timon_&_Pumbaa_-_Can_You_Feel_The_Love_Tonight                application/octet-stream
Sunnyday                                                      application/octet-stream
Star_Academy_3_-_Can_You_Feel_the_Love_Tonight                application/octet-stream
Lights                                                        application/octet-stream
Deep_Blue                                                     application/octet-stream
Animal_Kingdom_-_Can_You_Feel_the_Love_Tonight                application/octet-stream
skybowl_-_Lunar_a_Code_III__Variation_1                       application/octet-stream
Track 4                                                       application/octet-stream
Pride Lands                                                   application/octet-stream
MartinWolf_-_Can_You_Feel_the_Love_Tonigh                     application/octet-stream
Club_Mix_-_Can_You_Feel_The_Love_Tonight                      application/octet-stream
Gleb_Moiseev_-_Can_You_Feel_The_Love_Tonight                  application/octet-stream
William_Hung_-_Can_You_Feel_the_Love_Tonight                  application/octet-stream
Weekend_Drive                                                 application/octet-stream
Instrumental_Symphonic_ver_-_Can_You_Feel_The_Love_Tonight    application/octet-stream
something                                                     application/octet-stream
Above_The_Clouds                                              application/octet-stream
GTA San Andreas                                               application/octet-stream
Cougar_boulevard                                              application/octet-stream
Nu_Love_-_Can_You_Feel_The_Love_Tonight                       application/octet-stream
Skybowl - Upendi                                              application/octet-stream
Ensemble_Pro_Brass_-_Can_you_feel_the_love_tonight            application/octet-stream
NATURE                                                        application/octet-stream
Пурикусвадосия-2                                              application/octet-stream
DownMix_-_Can_You_Feel_The_Love_Tonight                       application/octet-stream
02_Fog                                                        application/octet-stream
var3                                                          application/octet-stream
Pine_Pipe_Instrumental_ver_-_Can_You_Feel_The_Love_Tonight    application/octet-stream
var2                                                          application/octet-stream
In the dark                                                   application/octet-stream
Skybowl - This Land (demo)                                    application/octet-stream
Skybowl - We are one                                          application/octet-stream
Toon_ver_-_Can_You_Feel_The_Love_Tonight                      application/octet-stream
Chaikovsky_like_ver_-_Can_You_Feel_The_Love_Tonight           application/octet-stream
Pattern 31                                                    application/octet-stream
Instrumental_Elton_John_ver_-_Can_You_Feel_The_Love_Tonight   application/octet-stream