The rep at the local computer store where I bought the lens cleaner recommended recording in CDA, an older standard audio format.
With info from
(see Burning CDs)
I used Audacity to generate a silent AIFF at 1 hour and 8 minutes, on a Memorex CD-R, 700MB, 80 Minute, 52x Multi Speed disc;
brought it into iTunes so I could burn it as an Audio CD.
I selected 8x speed on the hunch that a faster burn might compromise the burn itself, don't know if this made a difference.
Reason for 1hr 8min is the comment from the Audacity man page Red Book spec #1 that the max recordable time on an 80 minute CD is 79.8 minutes; I backed off that maximum to be safe.
Used the CD lens cleaner; popped in the Memorex CD-R;
Taj Mahal never sounded sweeter.
Thanks for the suggestions;