Various pubs and bars will have live music during mid week to attract customers.
Elsewhere there are some smallish music venues, such as Barfly, or The Globe (a short distance from the city centre).
Otherwise Womanby Street is a good place to head - there is the Welsh Club/Clwb Ifor bach which invariably has a selection of excellent bands; and there is the Toucan Club, which used to be sort of Jazz orientated until it moved to this new location. It always was a very chilled place and its new building is extremely pleasant.
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