I was actually astonished at the song selection of the Broadway revue that was performed on the Celebrity Equinox for quite a few years. (We were on that gorgeous ship back in 2010 and again in 2012-- same show more or less.) Amidst all the expected schlock, they actually managed a respectable Sondheim medley of 4 songs, including (if I recall correctly) "Putting It Together", "You Could Drive a Person Crazy", "Being Alive", and culminating in a performance of "Send in the Clowns" with an entire Cirque-du-Soleil- style pas de deux performed upstage behind the singer! Hysterical!
And Royal Caribbean's Allure of the Seas has a truly legitimate bang-up one-act production of CHICAGO that really knocked our socks off! Same staging and every bit the equal of the current Broadway production. (Or if that sounds like faint praise, consider it far superior to the Broadway company.)