What kind of music/song is liked by players in an difficulty chart obby and attracts players and will motivate players, more like good music for obby games
Easy difficulties - Boring (It is best to make these difficulties short so players don’t get bored)
Medium difficulties - Motivating
Hard difficulties - Intense
It’s your choice obviously.
But what I recommend is make it funny in easy difficulties,
Make it Motivating or childish in medium
Make it intense and motivating at hard