Andy Fairweather-Low belted out the vocal to 'High In The Sky' with Amen Corner in 1969. Saw him a few years ago at the Albert Hall when he was the support act to Eric Clapton. Have to say IMO his guitar playing was as good as Eric's.
https://www.youtube.com/watch?v=1pbVfKnWAOA
Make sure you've got the vol turned up to 'threshold of pain'!