I've been singing "Mercy Street" as a lullaby to my daughters for a few years. It's one of their favorite night-time songs. I know its origins might seem a little seedy, but I nonetheless like to sing it to them. Here's a recent live version:
Those harmonies at the beginning are pretty damn impressive. I'm jealous. I can't even keep my harmonies that tight when I'm in the studio and have all the time in the world!
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YouTube: ephemeral ideas