I don't know if they would still consider it to Hennessey's tavern but I only go upstairs to where the bar is late night to party and drink they always have a promoter outside that gives you two for one drink specials the drinks aren't that great but it's cool because they're cheap and you get two for the price of one so hey why not I used to go there when I'm on Fremont Street just to get my party started and then go somewhere else afterwards but they really do play pretty good music upstairs they do they use the other bands downstairs and Big Easy archetype of music that I listen to but it seems like they are always packed and full of people.
I have friends that come out a lot mm I guess so I always try to keep them from going to the strip and take them down to Fremont and this is you you are number one stop like I said it's my party starter and usually end up going there and coming back after our way out to get a few more drinks to top off and then go home.