What's a good site that's legal and safe for music sheets to play on the piano?

i want to find a site where i can print of free music sheets without risking any viruses or anything in my computer... i want to be able to play songs that are actually from this century and from modern day. :P im 14, so i like singers like katy perry or chris brown and stuff.





any suggestions?What's a good site that's legal and safe for music sheets to play on the piano?
http://pianotte.szm.com/M.htm


and


http://my-piano.blogspot.com/