Brian May did that 30 years after Robby Krieger.
All of Brian's harmony lines were doubletracked on queen albums.
They were not done with delay.
Makes sense but I remember Brian May using an eventide harmonizer for his live harmonies.
1. Guitar "harmonies" are a lot easier to do in the studio, than live.
2. Most forget that beyond the 9 - Vox AC30's May uses on stage, John Deacon built him "Deacy" which he will often place a coat over it, while recording.
3. Now, starting in 1972 Brian May was using in the Echoplex EP3 Tape Delay Studio and On-Stage (Gilmour and Wright from Pink Floyd used the Binson Echorec for Delay). Actually, he used two of them. Three amps on the Non-Delay Channel, three for Echoplex EP3 Delay 1 and three more for Echoplex EP3 Delay 2. Pete Cornish was hired by May to design and implement this system (later commissioned by David Gilmour in 76/77, 79, 99 & 06 to manufacture new pedal boards for each year listed). The above configuration was used on stage and in the studio until The Works. At that time (1982), he swapped the Echoplex EP3 Delay in favor for digital units. One of them at 900ms and the other to 1800ms.
In response,
They were done with delay.
Brian May is probably the Master of Delay, with Gilmour right on his arse.
BTW, News Of The World, was the first album that featured Brian May with an Eventide Harmonizer.....