I don't really like them, I have to say. I can see why they're popular though.
Top of the youtube listings:
this. Melodic guitar intro; Verse with small interval melody; 'chorus' (although it's more like a middle 8), major melody; major key interlude on synth marimba [?], descending into a free section (with plonky sax on the recapitulation). The rhythm ticks along behind it all, not really interfering with the melody, but the (melodic) vocal is the furthest forward.
This - vocal melody, to the fifth, back to the tonic (medieval?); melodic bassline. The melody doesn't change, and there's a solo going 1, 5, 7, 1. (My ears aren't the hottest at listening for intervals, so this may not be entirely accurate - it's all classic melodic behaviour though).