Are there any Irish bars in Albufeira and if so do they play live music?
Yes loads. I can't be specific about names etc as I do not go to them.
Haven't been since 1998 has it changed a lot?
The resident population has doubled in the last ten years or so. There are new hotels and condominiums everywhere and the town centre has been pedestrianised and prettified for tourists; the fishing boats are no longer allowed on the beach etc. The beaches are the same you will be glad to know, but rather more crowded!
I have heard it has gone very expensive to eat out and drink alcohol?
It's not particularly expensive compared say to the UK, but obviously since 1998 prices have risen the same as they have everywhere else. The recent fall in the value of £ to € has had the worst effect, as UK visitors now find everything seems to cost 20% more than last year.