There are a number of TV Shows that have not been released on DVD because obtaining the DVD rights for the music that was played on the original show would cost too much. (WKRP in Cincinnati being probably the most famous example.) However, the Simpsons uses quite a lot of popular music, and their DVD sets have been released regularly and affordably. Is the reason because:
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The other shows were released before home video, so they now need to buy the rights to include the music on their DVDs, while Simpsons is more recent and foresaw the possibility of home video when signing the ASCAP contract in the first place?
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Simpsons usage is mainly small bits of song, whereas WKRP uses more substantial clips?
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Fox is certain enough about the volume of DVD sales the Simpsons will generate to pay for the music rights, but the sales volume, and therefore profitability in the face of music rights costs, of WKRP DVDs is much more iffy?
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Some other reason?