The New Rag
is absolutely delightful and is very demanding on the descant and treble voices. It is always a personal joy to play bass whereby the "oom-pahs" are practically never on the same notes twice (just to kept on ones toes) at the same admiring the artistry of the upper voices. The tenor too, has its moments with rapid alternation between on and off the beat.
This version may be found in Scott Joplin Ragtimes