My favourite track from the last season is probably "I Prevail - Heart Vs. Mind". They always have the best songs to pump you up for when the particpants have to go in the pit for elimination. They played this song and I immediately became obsessed with this band.
I enjoyed Dream High and Dream High 2. These were about high school students studying k-pop, and many of the characters were played by k-pop stars. Dream High was noteworthy for introducing me to IU, who became a favorite singer of mine. I could not find anything from Dream High on Spotify, but here is a video of some of the characters singing a Girls' Generation song to cheer someone up. The first singer is IU, and I got chills hearing her sing this again.
Dream High 2 had a mostly different cast. The main character was a songwriter, and here is the song she was working on during the series.
When I was in high school, I would watch Fame on TV, and I had a soundtrack to the show on LP, which I would often listen to. It has many great songs on it, making it hard to pick one. I'll pick the first one, because it has a way of just sucking me into it.