Many have this, and it is a midi maker, so don't try to get a great quality out of it, but noteworthy composer is a great software.

It lets you use any instrument, any sound, any time of music. the only thing is, you need to know how to read music.
http://www.noteworthysoftware.com/

I've used this before! :)

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You can't wait for inspiration. You have to go after it with a club.
~Jack London

Screnzy '06--The Underdogs
NaNoWriMo '07--Zella
Screnzy '08--Jonah! :)

I don't suppose theres anything like this for free? I am a poor college student who can't afford something like that right now.

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I have never thought of writing for reputation and honor. What I have in my heart must come out; that is the reason why I compose.
~Ludwig van Beethoven~

Thanks a lot. This may well come in very handy.

I'm not even going to think about music until I've finalised the lyrics though, which sound sensible, but really because I want to put it off for as long as possible cos I'm scared...

Actually, there is a free adaption of it on the Nteworthy site I believe.
2007 Nanowrimo-The Elements: Document 242 50000+ words
2008 Screnzy-Cliquified! 9 Pages