On Google's home page, you can play on a synth complete with a four-track recorder and the ability to save your freestyle musicianship. The front-page Doodle honours the 78th birthday of the late Robert Moog, the inventor of the Moog synthesizer.
The electronic keyboard is avaliable on Google.com on Wednesday only. Developed in HTML 5, the synth allows users to record and share their tracks.
A Google Blog post explains why the search-engine market leader is honouring Moog: "With his passion for high-tech toolmaking in the service of creativity, Bob Moog is something of a patron saint of the nerdy arts and a hero to many of us here. So for the next 24 hours on our homepage, you’ll find an interactive, playable logo inspired by the instruments with which Moog brought musical performance into the electronic age."
Google also patched the keyboard into a four-track tape recorder so you can record, play back and share songs via short links or social network Google+.
Google uploaded a video to YouTube explaining how to best use the one-day synth. It explains you can play with the synth's knobs to change octaves, sound frequency, range and waveform. Filters let you adjust the tone of the system, with options for cutoff, attack, decay, contour, sustain, or glide.
The Moog tribute is reminiscent of Google's other popular Doodle, the interactive guitar to honour what would have been Les Paul's 96th birthday.