You might mistake this for a simple pop song, but looking closer reveals an unusual 9/4 time signature, most easily noticed when playing drums as the snare alternates between on- and off-beat hits. Other oddities include an instrumental chorus and bridge.
Guitar is most likely the most interesting instrument on this song, playing mostly fun riffs continuously.
Drums take a while to kick in proper, but they are a lot of fun, with many small accents all over the place.
Bass is less interesting, but the bridge is a highlight. Towards the end it picks up again.
Keys are simple outside of the bridge, which is a nice change of pace.
This song is fun to sing, but vocals/harmonies are not a highlight.