Something like notepad but with animated keyboard?

I'm looking for a simple FREE notation software which also has a keyboard window, so I can input notes via the animated keyboard.

I don't have a midi keyboard at home and can't read notation too well (used tablature for guitar). I started composing recently for piano and am looking for a software to speed things up.

Hopefully I described it well enough for you to understand what I'm looking for.

Thanks in advance.

ps - also, is there a free software which can transform an mp3 into midi format?

The only one I can think of is Anvil Studio: http://www.anvilstudio.com/

perfect! thanks

Be wary, however, some computers freak out when you press too many keys and cause the computer to not register some of the notes.

Anvil Studio is what I use...

Does Anybody know of any good sounds and stuff I can load into it? My current bank is quite limited.

I hear that you can load soundfonts into Anvil Studio, but I never could find out how to do it, so I now user SynthFont.

If you're looking for soundfonts, try HammerSound or SF2Midi for some good soundfonts. Most of them are junk, but there are a few standout samples.