Music for cats.... where can I find something suitable?

Dear George,
I need to consult you about human music. My humans feel the need to have music on almost all the time. The male has a preference for loud rock music, while the female prefers classical music - baroque, actually. I find the latter just about acceptable.
But the former is really hard on my ears. It thumps through the house and I find it difficult to ignore. Where can I find some music which is more suitable than this?
Yours
Sam.

Dear Tony,
Human scientists have been studying this and have proved that classical music, like Mozart, is less stressful for cats than loud pop or rock.
Better still, there is a human called David Teie who has composed special music for cats! He has had the good sense to pitch is two octaves higher than similar human classical music! Cozmo's Air, so called, has a rhythmic pulse similar to purring and Rusty's Ballad has a rhythm similar to kittens suckling. The notes slide up and down rather like cats miaows.
Cats much preferred it to human music, when a scientist Charles Snowdon tested it! Teie has now produced an album which can be heard here. Get your human to play it to you. 
And make your appreciation known by purring loudly in time to it.
Yours
George