In my band, Three Hour Tour, we play a lot of calypso and soca featuring steel drums and me on uke for some reason. Since our audience is usually a gaggle of guys in suits spitting up cocktails at business get-togethers, or parties with random parrotheads spitting up margaritas, or restaurants with folks scarfing jerk chicken (Mmmmmm... jerk chicken...) and the like, folks benefit from an informative intro on songs that are largely unfamiliar to them, and me for that matter. Most people could give a hoot, but some like it. The trick is to not do it on every song. Like deach says, "shut up and play" is the rule of the day. Here's something we might say before doing calypso classic "Rum and Coca Cola" :
This song was composed by Lord Invader and Lionel Belasco. It was copyrighted in the US by entertainer Morey Amsterdam, yep, THAT Morey Amsterdam, and became a huge hit in 1945 for the Andrews Sisters. It's about a mother-daughter prostitution ring working drunken American soldiers in the Caibbean...
There's also K.I.S.S. - "Keep it simple, stupid!" Remember, especially if you're being paid to PLAY, people want music, not long winded stories. And know your audience. If there are kids out there, they might not be suited to stuff like this!