You can not say only google. becoz i can easily find good songs downloading sites from any search engine.
http://songdownload.info seems to be new but it's a lot less spammy than other search engines. It has the one-click download button which makes it one of the best choices for me.
I got malware infection warning for song.pk from Avast! Internet Security. I use songspk.name now. As govt. blocks I use google search with songs pk & use the one that fits my need.