Yay! Nujabes and DJ Okawari are what I listen to when I'm happy, so I'm glad you like them. They're my calm, "good vibes" music. But I get the need to switch it up. Sometimes I feel the opposite of you- like I gotta swap out my chill stuff for more fast paced songs haha
The latter can be overstimulating, but the former can make me feel tired, so it's good to throw in some variety.
Love love love the beat and airy piano notes in Musical Chairs. Something about the textured mix of high, tinkly piano chords with rap, a good beat, a bit of distortion, and miscellaneous sound effects is so addicting. Thanks for my next favorite lol (..any similar recommendations? c:)
Different vibe, but the piano reminded me this song by Kalaido exists: