To install one of the themes, copy the file into your cmus home directory, in most cases ~/.cmus. To use it, enter the following command:
:colorscheme name_of_theme
Some of this themes may require a terminal with 256 colors.
white theme, 256 colors
### colors
### {{{
set color_cmdline_bg=145
set color_cmdline_fg=black
set color_error=lightred
set color_info=lightyellow
set color_separator=240
set color_statusline_bg=145
set color_statusline_fg=black
set color_titleline_bg=240
set color_titleline_fg=white
set color_win_bg=7
set color_win_cur=blue
set color_win_cur_sel_bg=240
set color_win_cur_sel_fg=white
set color_win_dir=lightblue
set color_win_fg=black
set color_win_inactive_cur_sel_bg=cyan
set color_win_inactive_cur_sel_fg=black
set color_win_inactive_sel_bg=gray
set color_win_inactive_sel_fg=black
set color_win_sel_bg=lightblue
set color_win_sel_fg=gray
set color_win_title_bg=240
set color_win_title_fg=white
### }}}