I guess all choirs are therapeutic, but for most of us it's a fortunate side-effect. Who knew that in Michigan there are actually Therapy Choirs??!! You can find out all about them on the Therapy Choirs website.
I remember saving up to buy the latest David Bowie record and playing it every day for months. I didn't like all the tracks at first, but slowly they grew on me. But now with music so available I hardly ever sit down and listen to anything as intensely.