Yorick, while I agree with you that some of the best music on an album aren't the "hits", I disagree that artists don't release songs which they know are bad. This may be done for several reasons. Some artists/groups are under mandate "finish the album by X or we will cancel the project". Sometimes artists in conflict with their label release songs which they know are poor to get out of contractual obligations. For example, Lary Norman's In the Garden was released for this very reason. I make this claim based on an article in Time magazine and hearing him state the same during a concert. Other times bad songs are released by artists who view music as just their job and not a "calling" ie. "We need to turn out a new song by the end of the day to finish this album." I have seen video interviews where several different performers have stated that they only do it for the money/fame/girls/etc. It isn't about the music for all muscians.
Personally, I never buy an album based on hearing one song. If it is a group or artist that I don't know, it could be that the one song I hear will be the only one which I will like. However, after hearing that one song, I will seek out the album and listen to it and then make a choice whether to buy or not.
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