A Town Called Gaga

About the rhythm thing. This goes much futerhr than just a few notes being a bit longer or shorter. A melody can get very different when the notes get to be different at the strong counts of the measure. There's also a big difference in the amount of swing a melody has. And don't forget rests.Also, when you look at full melodies, they're mostly build up from motives. One motive can be the same as in another melody, but if it's only three notes, the other ones will be different. This of course can go on forever. You can make them as long as you like.And there is also a different in octaves. An interval of an octave can be used in a melody as well and gives character, not only colour. And also bigger jumps. But the development of the melody plays a big role too. A melody can end up an octave of maybe two higher.There's also no specified time. A melody can be played in 64th notes if you like over a tempo of 200 bpm or whole notes (or longer) over a tempo of 10 bpm. They may be the same notes and have the same relation between them rhythmically, no one's going to hear them as the same. Even half tempo.So for every possible order of notes (including intervals over the octave) you have the tempo, rhythm, context (chords). I imagine the numbers get insanely big.