why google do this to me?

i have a mp3 site slammp3 dot com. some days ago i checked on google search site:slammp3 dot com and finds out over 200000 results. today i searched again and found only 2500 results. now can anybody explain this to me… what is this and how its gonna effect my site.. also i did not recived dmca complaints and my domain provider and hosting provider are not under dmca complaints.