Definitions by KRW :)
Indie Pop
A genre characterized by pop conventions and structure, and a melodic, lighthearted sound. Artists generally use typical rock instrumentation (drums, guitar, bass, vocals), although some artists deviate from this, sometimes including electronics, piano, strings, or even eschewing guitar altogether.---------------Some examples (that you should totally checkout by the way) would be The Score, AJR, Grandson, Quinn XCII, Mumford and Sons, Jon Bellion, etc....