Brian May's Tone has nothing to do with the month with the same name!
Every leap year, in the month of February, on that rarest of days that springs forth every fourth annual, Brian May is to be found at Stonehenge where his Druids prepare the rocket scientist for transcendent spacial explorations in the almighty quest for summoning his legendary tone.
Nymphs are summoned from far and wide to dance around the May Pole, and this semi-frequent act of frequency fertility is the real source of the guitarist's power — not a Red Special, nor a Vox AC30... though a Deacy is somewhat involved.