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		 Yes, technically there are an infinite number of musical notes. But that would be a bit too much info for our brains to process. This is a bit off the topic but we do only use twelve notes that is: 
A, A#/Ab, B, C, C#/Db, D, D#/Eb, E, F, F#/Gb, G, G#/Ab 
They occur in different octaves at multipes of their frequency and are the same note. A 'key' starts with a base note and follows allong a given pattern through this series of 12 to come up with a key. All keys are rearrangements of these 12 notes, there are infinitely more, but they aren't neccisary. 
		
		
		
		
		
			
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				Dropping a barbell he points to the sky and says "The suns not yellow, It's chicken!"
			 
		
		
		
		
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