Opera, L’Enfant et les Sortilèges by Ravel
You can always count on Ravel to put a few harmonics in the bass part; one piece I can think of is his “Mother Goose” Suite. At one time there were heated debates over suggested changes to some of the harmonics but now there is a general concensus of opinion that the printed part is correct.
I was fortunate enough to play a concert performance of “L’Enfant et les Sortilèges” in the late 1940’s with the London Philharmonic Orchestra conducted by Victor de Sabata the brilliant principal conductor and Director of la Scala Milan who had conducted the first performance. He got a wonderful performance and at rehearsal even corrected the pronunciation of a French choir that was brought over specially.
There is a big bass solo consisting of all harmonics combined with two flutes that starts near the beginning of the opera at Fig. 1 which goes on for 21 bars or so. It is very exposed. There are other difficult bits around Fig. 95 Adagio and 96. Victor Watson played the solo bass part which he found very difficult both technically and rhythmically.
Some years later I played the solo part. I got through it O.K. but I was glad when it was over!