Dona's suggestion is good. Do a web search for theme cruises, you might find something related to music within your time range. Also, work with a travel agent. You might be able to put together a package with prepaid booze.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014