Producer, musician, luthier and composer Galeazzo Frudua is credited for being one of the main experts in The Beatles vocals.

With more than 300 guitars built in his life, he's the only luthier mentioned in the official Fender Stratocaster Wiki page

Galeazzo Frudua owns different Youtube music-related channels featuring almost 18 million views and almost 100.000 subscribers, where he teaches music and guitar repair.