Of late I have really been into jazz music... primarily jazz-fusion and acid jazz.
One of my most recent must play (almost everyday) groups is a jazz-fusion band called Brand X. Brand X formed in 1974 (and they are still touring and recording to this day). In 1975 drummer Phil Collins (and singer of the band Genesis) joined the band.
Here's a clip of a great song from 1976 called "Born Ugly".
The experimental side of jazz music is one Carpenters experimented with early on in their career with their creative recordings of songs like "Caravan" and "Iced Tea", and then again with recordings like "All I Can Do", "Another Song" and "B'wana She No Home".
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