Isn't distribuiting copyrighted material, such as sheet music, illegal? Do you not have to have an agreement with whomever the authorized music publishers for the sheet music you are offering for free?
You can download free sheet music, legally, provided it is royalty free, and most of these are old, classical pieces.
But sheet music, like for High School Musical, does not fall into that catagory, and you could get yourself into trouble offering it for free here on 8notes.
You can download free sheet music from a legal source at
Free Sheet Music Digital Downloads
There are many sites, where you can buy the sheet music, and get legal copies. An example of where you download High School Musical sheet music from a legal source is at
Disney Sheet Music .