Tsdl_mixer provides bindings to SDL2_mixer intended to be used with Tsdl.
It has as siblings tsdl-image and tsdl-ttf.
Note that these bindings are at an early stage and have only been used minimally. The interface may change. Comments and bug reports are welcome through the github page.
Via opam:
opam install tsdl-mixerDocumentation is here. It can be generated with dune build @doc, but the binding follows the SDL2_mixer interface closely, so it may be sufficient to consult its documentation.