(Video embedded below the break.) A few simple parts later (Arduino, MP3 shield, magnetic door reed switch) and a tiny bit of code to randomize which bass riff plays, and it’s a done deal.

[laughs] I started fooling around with these riffs that sounded cool on the six-string bass, and you could get ... though it's pretty easy to hit some chords… I mean, so many Stones songs ...

Rock bass lines are usually very simple, and relate to the rhythm of the guitar part. Many pop songs will use bass riffs. This is a short catchy tune. They fit with the notes in the chord but ...