DirecTV has pretty good music channels and you can look up the artists name and then go buy it. My college radio station is where I get most my ideas. Also the magazines like TAS and Stereophile or HI FI+ all recommend some terrific music which is half the reason I buy them.
On a more thoughtful note of response; My sources vary widely and include some of those listed above. I'd add to the list some very good friends who are constantly on the prowl for good music. A'gon forums too. Another good resource I've found, believe it or not, is Amazon. Many times when I've been introduced to something new I'll go take a peek at what other folks who liked that particular artist are buying. I wouldn't go as far as to buy such a recomendation blindly, but i will actively seek out recommendations based upon things that come up frequently there in my searches.
Although FM radio is sometimes helpful, I often buy music based on the artist, the composer, and similarity to recordings that I already have and like. For example, if I like one Mozart Symphony performance by a particular conductor and orchestra, I would be likely to buy another Mozart symphony recording by the same outfit. I am also influenced by technical quality of the recording...for example I buy almost every Tacet DVDA that I can find.
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