Anders, if you have ABC's for the tunes, you can produce sheet music in just a couple of minutes by using the free Digital Tradition Folksong Player (a variant of Music Ease). This allows you to import ABC files directly.
I will have to rely upon some other Mudcatter to post the URL. The only downsides are that it requires Win95/98 and the un-registered version prints a watermark in the background. ABCMUS is a MUCH better vehicle for playing ABC's by the way.
Once you have the DT Player loaded all you have to do is to File Open, Tools Cast Off, File Print.
If you REALLY want to produce GIF's then get back to me via this thread or at johninbrisbane@hotbot.com
Regards
John