ENGL is a German company that makes high-end tube amplifiers for electric guitars. Over the years ENGL has succeeded in becoming a global player in this market. Currently the company competes with leading makes such as Marshall and Mesa Boogie.

Notable users include: Ritchie Blackmore, Chris Broderick, Phil Campbell, Marty Friedman, Craig Goldy, Jeff Loomis, Steve Morse, Rudolph Schenker, Paul Stanley and Glenn Tipton.

The Steve Morse Signature 100 E656 is a 3 channel amp designed for and with Steve Morse, lead guitarist of Deep Purple. The amp is based on the ENGL Invader, omitting the two high gain channels to feature one extremely versatile lead channel. All three channels on the Steve Morse have an individual equaliser. The lead channel gives extended control over the midrange by means of two sets of mid controls; high mid 1, high mid 2, low mid 1 and low mid 2. The two sets are individually switchable and combined with the tone switch that allows for 8 different equaliser settings within the same channel.
Furthermore, the amp features two parallel effects loops, a noise gate, two master volume controls, tone- and gain switches for all channels.

Lester William Polsfuss (June 9, 1915 – August 13, 2009)—known as Les Paul—was an American jazz and country guitarist, songwriter and inventor. He was the inventor of the solid-body electric guitar which made the sound of rock and roll possible. He is credited with many recording innovations. Although he was not the first to use the technique, his early experiments with overdubbing (also known as sound on sound),delay effects such as tape delay, phasing effects and multitrack recording were among the first to attract widespread attention.

His innovative talents extended into his playing style, including licks, trills, chording sequences, fretting techniques and timing, which set him apart from his contemporaries and inspired many guitarists of the present day. He recorded with his wife Mary Ford in the 1950s, and they sold millions of records.

Among his many honors, Paul is one of a handful of artists with a permanent, stand-alone exhibit in the Rock and Roll Hall of Fame. He is prominently named by the music museum on its website as an "architect" and a "key inductee" along with Sam Phillips and Alan Freed.