T. Rex – 20th Century Boy (released as a single, 1973 EMI) In a time that was dominated by rock n roll machines such as Pink Floyd (Dark Side of the Moon), Led Zeppelin (Houses of the Holy), and The Who (Quadrophenia), a few “Glam” rock bands were embracing style and theatrics into their music. Artists like David Bowie, Alice Cooper, and T. Rex were making rock music more diverse. T. Rex originally made acoustic albums, but turned on the amplifiers for their seminal album Electric Warrior. Marc Bolan and company always managed to keep an organic sound, despite plugging in. 20th Century Boy really isn’t really a “heavy” song, but a great riff is a great riff. Marc Bolan could write a catchy song, that’s for sure. Tragically, Bolan passed away in a car crash in 1977.