Cardiff is equipped with venues from pubs of a maximum of 150 people to the 60,000 capacity of the Millennium Stadium, with most sizes in between.
The best known for live bands are established venues such as the Barfly, Clwb Ifor Bach and the Coal Exchange. Many dance clubs put on DJs regularly and smaller venues such as the Buffalo Bar and upstairs at Dempsey's have live bands now and again. New clubs appear rarely, but the most recent is probably Cardiff Arts Institute.
Bogiez - Cardiff's only rock bar and nightclub. Bogiez has decamped from two or three nights a month at the Millennium Music Hall to a permanent, full time venue at the old Cardiff Barfly.
Clwb Ifor Bach - Womanby Street (road opposite the castle next to Dempseys) - The Welsh Club, so-called because it used to be a members club and you had to speak Welsh to get in, or so the story goes. Now it's a three-level club and venue (usually only ground and top floors are used though) which is host to many a fine band and used by several local promoters. Always worth checking out what's in store here. The regular nights are 'Just Dance' on Tuesdays, 'Listen Up!' on Wednesdays, drum n bass Aperture on Fridays and electro-pop/retro/mixed on Saturdays.
Cardiff International Arena - (now the Motorpoint Arena) Mary Ann Street - Cardiff's biggest venue for touring bands, excluding the monsters who play the Millennium Stadium. Some gigs are all seated which is very annoying, but not a bad venue to see a big band in.
CF10, Solus, The Great Hall - Cardiff University - three venues ranging from CF10 at about 300 capacity, to Solus at 900 capacity to the Great Hall for big touring bands. CF10 used by SelloutPromotions occasionally. All three sometimes student-only access. Details can also be found at Cardiff Student's Union.
Buffalo Bar - Buffalo Bar has established itself as an adequate, intimate live music venue hosting an eclectic mix of bands much loved by true modern day open-minded indie types. Coupled with Buffalo's unique atmosphere and loyal clientèle, a gig at Buffalo can make for a cultured night out.
Cardiff Arts Institute - Park Place. Cardiff's newest live music venue is very much an all-round arts institute. With a wide variety of often free events happening every night of the week, the Cardiff Arts Institute also calls itself a canteen and serves food all day.
Coal Exchange - Mount Square, The Bay. The Coal Exchange reopened on Tuesday 3rd November. Major redevelopment was planned but this has fallen through so Cardiff gets back a great venue! However, it hasn't been made much use of and there has been little put on in the way of live gigs.
10 Feet Tall is a three storey venue on Church Street in the centre of Cardiff. Run by the same company who own the Buffalo Bar, reviews suggest the atmosphere is great but the drinks are a little pricey. Much like Buffalo then! The basement has recently become established as a small live venue called 'Undertone'.
Millennium Music Hall - closed. Was next to the Cineworld cinema on Millennium Plaza but closed down under the guise of looking for a new home.
Tommy's Bar is the Student Union of Cardiff School of Art, at UWIC Howard Gardens. Fridays are the regular live music nights and it's also available for hire to promotors. Gigs are open to the public as well as students and the bar's a bit cheaper too.
The Globe - a venue on Albany Road in Roath; it avoids having to go into town for those living on that side of the river. A good venue say most that go, the only one of its size in Cardiff. Under new management, yet to see what the line ups are going to be like, although they do still seem to be putting on a lot of tribute bands.
Dempseys - Castle St. - random gigs upstairs by local promoters; often an out-of-town headliner with a couple of local supports, usually a good vibe and a reasonable night out.
Le Pub - Caxton Place, Newport - the city's alt rock and punk haven with two floors of friendly weirdness, excellent juke box downstairs in the cavern, while bands play upstairs in the attic. Beware their huge, slow myspace page - best look at other sites such as welshgigs to find out who's playing there.
Bristol Biekeller - if you feel like a trip a bit further afield.