if it costs something (again, nothing wrong) then
it's not... free.
Neglecting the need for musicians to eat, the actual production of
music costs money. It may be studio time or the cost of buying your
own equipment, but it isn't gratuit, free as in beer, or 'gratis' as
we say in England.
On the other hand, if I sell you a CD of music that you can
redistribute, sample or remix, then it's probably more 'libre' than a
CD which is gratis, but has DRM on it.
Cheers
Daniel