Well the *beep* thing is because said music is copyrighted.
Anyway, just google "*beep* music" (of course replace the *beep* by the series' title) and you'll come up with some answers (I was given a link to the OST CD at Amazon.com where you get a review and a Tracklist, sometimes also stating the artist).

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"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-