About the Tune Formats

NoteWorthy Composer

Some good features such as transposition, midi playback, multiple staves
and a midi to printed notation converter.
NoteWorthy Composer Software Site

ABC

ABC is a widely used text based way of transferring music files and then viewing them
as proper notation or playing them. The files are incredibly small, so download is fast.
There is a *huge* number of tunes in abc format on the web, so it's almost guaranteed
you can find the tune you want out there.
Find out more about the abc format at the abc home page

Get the software from the ABC2WIN software site

Gifs

There are a limited number of straightforward viewable tunes as gifs.
These are just images of the notation.