As a student with the School of Rock, Cinema Dave will play bass on this song;
"Plug In Baby" was Muse's then most successful song when it was released as the lead single to Origin of Symmetry in 2001. The song has remained popular and widely recognised ever since its release and has been played at almost every Muse concert since it was premiered in 2000. Originating before the release of Muse's debut album Showbiz, it was the only song to be latterly revisited from Muse's large repertoire of early demos for recording, after undergoing some significant changes.
The song was originally about a protagonist's interaction with virtual reality, though the lyrics later became abstracted such they no longer explicitly explored this theme, leaving the song open to a wider interpretation, as indeed the band themselves have taken.
According to Matt, he wrote the song above a sex shop, "It sounds made up, but it was written above a sex shop." so, it's more likely that song talks about a sex toy. 
Matt and Dom came up with the title while flicking through a catalogue, Matt found something about plug-ins and decided to name the song like this, according to Matt 'it just sounded cool for a song'. 
It was planned to be released on Showbiz but they ended rejecting it, later, they decided to 're-invent' it and later they released it on Origin of Symmetry.
Plug In Baby is an electronic rock song written in B minor. It's guitar-driven, and moves at a fast tempo of 135 bpm. The guitar riff is heavily based upon the B minor harmonic scale, with a few accidentals. Similar to Showbiz, the song begins with a simple rhythm and builds, before climaxing with a very high vocal note.
Bellamy's vocal range spans from C♯3 to F♯5, one of the wider ranges in a Muse song.
Description and Composition information provided by - https://www.musewiki.org/Plug_In_Baby_(song)
Thus far, Cinema Dave is practicing the "bass groove" for the J.S. Bach - "Toccata and Fugue in D minor BWV 565" section,
that has nothing to do with Strauss or Vivaldi.