Have you discovered Tatsuro Yamashita yet? For many, he is synonymous with City Pop
I'd recommend this compilation, if you can find it. It's a greatest hits volume under the guise of a radio station broadcast, complete with lead-ins from the DJ and commentary between tracks. It's a real treat to listen to - and the included songs are fantastic!
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His album Moonglow is a little easier to find, sometimes. Not sure if you collect vinyl records or not, but Mercari and Discogs seem to be the best, most-reliable places to find them online. You can always try eBay, too, but I find they tend to be a bit pricier.
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When Ship to Shore Phono Co was still around, they got me turned on to Piper. Gentle Breeze, Summer Breeze, Sunshine Kiz, and Lovers Logic are fantastic albums - and all pretty easy to find on YouTube!
I do love City Pop, but I also like the stranger electronic sounds of groups like YMO and whatnot. It's unreal how much pioneering Japanese electronica has been sampled and used in other songs over the years. Makes discovering the OG tracks that much more fun.
It's kinda cheating, but I do like this track featuring Ryuichi Sakamoto and Thomas Dolby. Once you go down the Sakamoto rabbit hole, there's no way back out...