I did check... I added these lines to .csv:

PHP Code:
test_music,1,music/music1.mp3,,,,,,,,music,streamed,,,,all_mp,,,,,,local
test_music,2,music/music2.mp3,,,,,,,,music,streamed,,,,all_mp,,,,,,local 
Added music1.mp3 and music2.mp3 to sound/music folder

In sd.gsc added this into spawnPlayer():

PHP Code:
spawnPlayer()
{
...
self playLocalSound("test_music"); 
...
} 
but doesn't work.