You could copyright everything together as a single work, but the potential problem down the road is when you try to release or sell the rights to any individual song. From a legal standpoint, it could get very complicated.
You will need to send or electronically transmit a copy of the entire song and a copy of the lyrics. Either the complete sheet music or a recording of the entire song is acceptable.
The $100 fee you are referring to is probably pre-registration, which is not required and most of the time not useful except in very specific circumstances. Your songs will still be fully protected under U.S. copyright laws without have to pay this fee. Go to www.copyright.gov for more info.


