Turn it up to 11: tech's contributions to rock and roll

Many of rock's greatest moments hinge on shifts in music technology. Here is a chronology of some of the highlights.

Marshall Amplifier Stacks



Of course, electric guitars can't rock without amplified sound.

Enter the Marshall amplifier, which started out as a copy of a Fender Bassman amp but ended up with a "roaring" sound of its own, attracting the attention of musicians like Jimi Hendrix, Eric Clapton, and The Who. But why stop at one? Marshall amplifiers travel in packs, like the three-by-six stack shown here, used by the heavy-metal band Slayer.

The stack started with The Who, but it quickly became so popular with performers that a wall of Marshall amps is now synonymous with rock . In fact, many concert setups have several racks of Marshall amplifiers that aren't actually powered because the speaker overload would wreak havoc on the show's acoustics.

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