Here's a list of artists used in the large-scale bliss cover art lookup test. You can click through on each artist to find what album art bliss found for the artist.
The large-scale bliss cover art test is a periodic test that is run to ascertain that bliss is (1) finding enough matches for album art queries and (2) the matches are accurate. I would be grateful if people could report any inaccurate art to me at email@example.com.
The dataset for the test is derived from a query to DBpedia, whose data comes from Wikipedia. The query itself uses the Rock and Roll Hall of Fame inductees category to decide which artists to use, and then attempts to find the album art for each album each inductee has released (or has been documented to release, according to Wikipedia).