Being a music (and gardening) illiterate I'd like to know: How do you compost a tune? :-)

Step one: Learn a tune by heart.

Step two: Bury it deep in the back of your mind.

Step three: Let your conscious mind forget it, while your subconscious breaks it down into simpler componants, and mixes it with bits of all the other tunes you have learned by heart and buried.

When you need a new tune, get into a slightly meditative state, reach down int the back of your mind, and see what you pull up. I assure you, you'll find a rich organic, mix of all the tunes you've composted!