Moog synthesizer
The track is known for its distinctive usage of the Moog synthesizer which was made available the same year of the song's recording. In the Doors' biography "No One Here Gets Out Alive", authors Danny Sugerman and Jerry Hopkins, described "Strange Days" as "one of the earliest examples of the Moog synthesizer in rock". The synth was hooked up with the help of Paul Beaver and contributed by vocalist Morrison to filter his vocals by playing notes. Doors' engineer Bruce Botnick recalled the usage of the instrument: