One of the things I'm finding Wikipedia good for is identifying who wrote what songs. There are many lyrics sites on the web, but most of them make it difficult, if not impossible to submit corrections or added info, such as composers. On Wiki, if someone posts partial or incorrect info about a song, it's likely someone will correct or supplement the info before long.   (Unfortunately, Wiki won't allow posting lyrics that are still under copyright protection, but it is a good source for songwriter info and for who recorded what song when, etc.)