nostr:npub1xm6xlrqwc52re7jgnpdl2x09779lujrk6rmprer8rhngk342wxrsa772uk nostr:npub1f5h6emnhzs97u6u8vzk04l4xymxpljpqaurnrhshykrnn4my829q79wjhr and tied to Iron Butterfly as the first heavy metal band for it's metal name and the heavy sound of In-A-Gadda-Da-Vida. But all that could have been verbal use circa 1968 with Cream magazine solidifying its use as a formal category in print in 1970 reviewing this band that I've never heard of before or since.