windsock

Props to you for looking into the question so much, but I feel like it's safe to assume threads like these are just looking for stuff in the same genre ballpark. If someone brings up Champagne Supernova, I'll give 'em Bittersweet Symphony. I think their answers to the suggestions you give are more helpful than trying to pinpoint exactly what the like about the original so you can give them as similar a song as possible as it both (possibly) broadens their horizons as well as gives you a deeper look into what they enjoy. That's just me tho

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RYM
Last.fm