It's amazing how far the logos have evolved. I used to work with the original doodler of the logos and I always thought his work was great, but the dedicated doodle team lead by Ryan and under Marissa's wing have made them 10x better. Designing logos that engage the audience is brilliant. Kudos to the new doodle team.
This got me curious: what does pi sound like? And the answer is that it's actually surprisingly tonal. The opening "31415" firmly establishes the key, and thereafter there's sonorous intervals to keep everything fairly well-behaved; the few out-of-place notes can be dealt with by an appropriate sort of rhythym. If you're gonna try it I recommend it as far as:
Pi actually reminds me a bit of "Nimrod" from Elgar's Enigma variations. The opening is only one note off, and then many of the later sequences in pi have the same large jumps that Nimrod does.
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Clicking on the logo takes you to the results page for the query "Les Paul", the 1st result is Wikipedia, which, if you read it, should answer your question..