I once saw a printed program of a Jussi concert at the Philadelphia
Forum, 1957 (I forget the month). Listed in the program was the aria Un
Di All Azzuro Spazio from Andrea Chenier. I was quite surprised, since
Jussi is not known to have ever sung that aria. I believe the program
was in error - Jussi most likely sang Come Un Bel Di Di Maggio, not the
Improviso. Jussi once mentioned that he would like to record the entire
opera, Andrea Chenier, but, sadly, never did. Had he lived longer, he
probably would have. He even mentioned that he would like to record
Otello, someday. Had he lived longer, he might have. Ciao.