The Nex York Times - Frommer's
Review
Old Man's offers the best music pub in Hungary. Concert and dj every day till down.
http://travel.nytimes.com/travel/guides/europe/hungary/budapest/25516/old-mans-music-pub/nightlife-detail.html

Very great place to go and have fun!!! It is not just an Irish pub, it is a disco bar. You can enjoy your time being there especially on Mondays!!!! It has great selection of music, basically plays all the best music from old stuff to very new popular music!!! Dance floor is not big, but funnn!!! :) Can always meet interesting people from different parts of the world!!! And even make friends!!!
Gaga-London

Fodor's Review:
One thing you can't fault this dimly lit cellar pub for is consistency; it's packed even on Monday night. Of course in Hungary that means you'll be inhaling a fair bit of second-hand smoke. If that doesn't ruin your fun, enjoy the live bluesy rock and jazz, as well as the friendly chaos behind the bar—while everyone squeezes onto the small dance floor.
http://www.fodors.com/world/europe/hungary/budapest/review-116872.html?t=1