I remember hearing this exactly once on the radio probably WAAF, in those days a free-standing, non-corporate rock outlet in Worcester, Massachusetts and it stuck with me. It went to #1 in the UK, but it never charted here. I turned up this nifty Top of the Pops segment that is pretty faithful to the original:
Reprise, T. Rex’s Stateside label, was hot for some chart action here, following the success of the Electric Warrior LP and the Top Ten showing of “Get It On,” rebranded here as “Bang a Gong” to avoid confusion with a Chase single that sounded nothing whatever like it. However, “Telegram Sam,” the first single from The Slider, stiffed in the marketplace, and “Metal Guru,” the second, did not so much as Bubble Under. (This didn’t stop Reprise from reissuing it on the Back to Back Hits series, b/w “Jeepster”; this is the copy I have.)
Someone else who was deeply affected by “Metal Guru” was Morrissey. Johnny Marr, who should know, said so:
When we wrote “Panic” he was obsessed with “Metal Guru” and wanted to sing in the same style. He didn’t stop singing it in an attempt to modify the words of “Panic” to fit the exact rhythm of “Metal Guru”. He also exhorted me to use the same guitar break so that the two songs are the same!
I admit here to never noticing that, and I’m normally pretty good about spotting borrowed sequences.