a really basic way to controll xmms2 from your vim session:

#+BEGIN_EXAMPLE
    map <leader>xn <Esc>:!xmms2 next<CR><CR>
    map <leader>xb <Esc>:!xmms2 previous<CR><CR>
    map <leader>xP <Esc>:!xmms2 pause<CR><CR>
    map <leader>xp <Esc>:!xmms2 play<CR><CR>
    map <leader>xs <Esc>:!xmms2 stop<CR><CR>
#+END_EXAMPLE

now, type =,xn= in vim, and xmms2 will start to play the next track from
your playlist.