[78-L] Nelson Riddle Question

[kil at roadrunner.com.invalid]

LISBON ANTIGUA by Riddle was definitely on 78 in the UK and New Zealand, at least.
So this question is not off topic.
I found a few sources that say Riddle himself played piano on LISBON ANTIGUA.
Another, usually reliable source, says Stan Wrightsman was on piano.
Can we put this lingering mystery to bed? :-)   
Does anyone know for sure?
Is there a sessionography online for 1956 Capitols?
RayK