Tim gave great answers, I’d just like to answer number 5:
“Power chords” is not a typo — it’s a musical term for a technique usually involving an electric guitar, especially typical of heavy metal music. “Ripe and ragged” clearly refers to their style of playing music. In a nutshell, a power chord is when you play perfect fifths in multiple octaves, with a lot of distortion, at high volume.
Am I the only one here who likes that music?