SDL_mixer callbacks

I was wondering if music channel was stop while affecting
one of the others (1-8) with Mix_PlayChannel() and if
it’s not, how could this be ?

Is there a callback for sound channel (1-8) and on other
for music ?
I know that there is an audio callback (SDL_LockAudio())
that cut both sound and music but can’t find the way
music and sound are cut while affecting channels
(Mix_PlayChannels(…)and Mix_PlayMusic())

if there is two callback for sound and music where I can
find the code for music callback ? it might be MusicCMD
isnt’it ?

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