.... Of course not! :-) ... I know, the title sounds rude a bit isn't it :-)
But check the video below; it's a very interesting analysis that explores many parameters ....
In fact, it's true that us, composers, have to deal with only 12 notes during our entire life right? :-) .... Just, think about ....
And yes, it's not infinite, but I think we still have a lot of possiblities yet. Actually, on many ways, it's the "market" or "industry" itself, (and whatever it is, classical, rock, pop, dance, electro, etc...) that limits us somehow, and because how we've been educated and how we educate others ... Also because we're used to repeat a certain amount of patterns in each style we do, because we've learned them ... And finally, because we're inspired by others who have followed the same way ... 'see?
The links, mentioned in the video, and some more:
Axis of Awesome 4 Chords:
Interactive video demonstrating common meter:
Everything is a Remix:
Stairway to Gilligan's Island:
Covered in Bees calculates the number of possible 5 minute CD-quality audio files:
ferrouslepidoptera calculation: http://everything2.com/title/How+many+melodies+are+there+in+the+universe%253F
Sounds Just Like:
Compression and song enjoyabliility:
Why are octaves divided into 12 intervals: