D'Arcos is a Spanish-run bar/restaurant attached to the Hotel Reveron, just up the hill from the roundabout near the Hotel Arona Gran.
It has undergone a thorough refurbishment over the years. I worked there for a time, as half of a duo.
The last time I passed the place, there appeared to be a keyboard player sat in the corner, playing background music.
These days, apparently, the bar provides some sort of varied entertainment every night. You may find a live singer, a speciality act, an Elvis tribute act - even a parrot show!
I have called in on rare occasions for a coffee and, I have to say, found the prices a little steep.
D'Arcos, it appears, is one of those "tourist" bar/restaurants that ups its prices to cash in on holidaymakers.
There are quite a few hotels in the immediate area and, for people staying in them, it is a handy venue for dining and enjoying a relaxing drink.
It's amazing how things change.
I was in Tenerife recently (Nov 2009) and can report to you that this bar is no longer D'Arcos, but a pizzeria/steak house called "Little Italy". Inside, it looks a very presentable restaurant - can't vouch for the food quality as I've not eaten in there.
There is some equipment set up in a corner which indicates that there may be some sort of live music on. It isn't, however, advertised outside the bar, so my guess that it is background music supplied, probably, by a Spanish/Canarian musician...but don't quote me.