My favorite beers are definitely Guinness, and I don't know for others country but, sadly, here in France not every bar serves Guinness. Anyway don't worry anymore (if you ever started to ) I'll give you the address of one of my favorite places to drink Guinness in Paris, and it's called : the Guinness Tavern !
It's a nice pub in the center of Paris where you can drink Guinness (as well as 14 other beers) and listen to music (usually played by a live band !!!). The musical style is definitely "rock" from the 60's to nowadays so you may end up singing out loud with the bands because you know all the songs
Well, I know their website looks a "little" messy but make no mistake : the pub itself is spick and span, and this website is useful as you'll find there which bands are planned when, the dates of their next "special theme nights" and, of course, their address :
31, rue des Lombards Metro Chatelet RER Les Halles 75001 PARIS