The Defectors Weld is a cool-looking bar on Shepherd's Bush Green which markets itself as such. It professes to 'not playing house music' on Fridays, perhaps to appeal to the older crowd and has a line-up on Saturdays of 'folk, trendy electro from Berlin' no less, 'some rock 'n' roll' for those that don't fit into the electro-folk scene and acoustic nights on Wednesday for those that don't like rock 'n' roll. So unless you're a Vorsprung durch techno head you should find a night that suits you best.
There is a good-looking cocktail list which is reasonably priced and on special offer at the weekends plus a fairly basic food menu, not so reasonably priced. This is however probably the nicest pub you'll go to in Shepherd's Bush and if you find the food too expensive I'm told there's a delicious place across the road that serves cheap curried goat.