Grimy, loose and chaotic garage rock with very strong hooks and pop edges. The real problem is that it's basically nothing new. Underwhelming in that sense, devolving even. Inferior to Arabian Mountain by far in song and production.
They still have that dirty, carefree, uncompromising vibe, but on Underneath the Rainbow it’s able to be tamed, morphing into melodic garage rock that’s as catchy and easily digestible as it is rugged and in-your-face.
Sadly Arabia Mountain's residual nastiness and speed is pretty much gone, replaced by slow tempos and weird deviations. It's experiments with synths and disco beats that cause some of the record's truly worst moments.