Noting the licensing problems... It seems like it would be an incentive to upgrade to premium to automatically note and play songs together that are "peanut butter and jelly." It's especially true when those songs seem to have been played that way on the radio. For example, Bob Seger's Traveling Man/Beautiful Loser, and Jackson Browne's Stay a Little Longer/The Load Out, Pink Floyd's three parts to "Another Brick in the Wall." When you hear them on Pandora, you think "Where'd the rest of the song go!?" And having to build a playlist yourself (rather than insert the two-fers into the rotation) just makes it harder to use because, for one thing, you have to figure out that the second part of the song is called "Load Out." (Something I didn't know till I started writing this and editing it to make it coherent!)
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