TIL That Freddie Mercury had the most unique singing voice by having his vibrato at 7.04 Hz while the typical vibrato would fluctuate between 5.4 and 6.9 Hz User guillermoftw, in the Today I Learned (TIL) subreddit, 06 Jun 2018
Freddie Mercury: acoustic analysis of speaking fundamental frequency, vibrato, and subharmonics User srw, in the Reddit Science subreddit, 22 Apr 2016
Some scientists have conducted an in depth acoustic analysis on Freddie's voice, it's fascinating. User LordMoeNeralic, in the Queen: The Greatest Band in History subreddit, 19 Apr 2016