All of the Carnival ships I have been on have had karaoke. Usually in the disco. Check the Carnival Capers when you get on board for time and place. Usually, there was a good turn out and some people were actually pretty good!
Booked: CARNIVAL DREAM!
Carnival Spirit '09, Liberty '07, Spirit '05, Valor '05, Glory '04, Pride '03, Destiny '02, Elation '01, Tropicale '91, RCCL Viking Serenade '93, Pacific Princess '78
everytime i've been on Fantasy they've had karaoke in Cat's Lounge (check your Carnival Caper for times). it's fun to go to the piano bar too (Cleopatra's) if you like to sing along with songs. my friends and i usually go to Cleo's after dinner, then hit Cat's for karaoke and then Electricity Disco to dance........then pizza, midnight buffet, room service.....hahhahaa.