The Pretty Things' reputation largely rests on tough mid-‘60s rockers like “Judgement Day” and “Balloon Burning,” a masterstroke of soaring psych pop. Yet they didn't stay frozen in the ‘60s, venturing instead into the beefy hard rock of “Singapore Silk Torpedo,” a highlight of their albums for Led Zeppelin's Swan Song label, and the darker terrain of “Goin' Downhill,” a sign of their undimmed potency upon reuniting in 1999.