[78-L] Choral key question

[Don Cox]

Hello David

On 19/12/2013, David Lennick wrote:
> Got an interesting problem here, a group of 4 sides recorded by Decca
> in 1937, possibly on portable equipment, of a gospel group with piano
> accompaniment in Chicago (or by a team from Chicago on remote), and
> the speed drops radically on each side. Around 5 percent. My problem
> is to figure which key they're singing in! Obviously a good
> accompanist can play in just about any key, but which seems more
> likely, A or A Flat? (Okay, or G Sharp?) To start in A I need to go up
> close to 7%, and end the side around 2.2% up. A flat sounds a bit more
> natural but the sides will end up 4% down at the end. Any thoughts,
> choirmasters?
> 
Can you detect any mains hum ?

Regards
-- 
Don Cox
doncox at enterprise.net