Wow never thought I would see a message on here about Dunedin. I grew up in Dunedin and hope to return there in the next year or so once I have twisted hubby's arm gently persuaded my DH.
It is a great city to live in and a great place to bring up kids IMHO.
One posh part is the area between Maori Hill and Belleknowes...although it doesn't take long to be in less salubrious areas. There are lots of lovely streets leading off George Street where there are massive, lovely houses with easy access to town/Uni and have mixes of people living there from students, families and professionals. Also, in Winter you can just slide down the ice into town!! ha ha
The main student area is North Dunedin, best to avoid right by the University. Anything past the Botanical gardens heading up North East Valley is fine.
Do look at South Dunedin, St Clair is lovely. Tainui and Musselburgh very family orientated but not posh at all. St Clair has some lovely houses, very easy access to the beach, salt water pool, and has some lovely cafes. There are certain streets in St Kilda that are lovely too.
If you wanted more of a community feel you could try the Peninsula (Broad Bay etc). Bit of a long drive though and might not be so great if you do lots of things in 'town'.
There are plenty of great suburbs to live in in Dunedin, and the great thing is you are never too far away from the centre of town (unless you want to live a bit further out).
Sorry I can't help you out on the music part, I am not musical at all!
Check out www.ero.govt.nz for school information. Watch out for decile rating, this is not how good the school is, it is a calculation of socio economic profile and income of school area and can be misleading (although probably best to stay away from decile 1-3 schools). Read the ERO reports.
Try www.trademe.co.nz for property, it has streetview which is great as you can get a real feel for the neighbourhood. Google earth is your friend.
Honestly, it is such a lovely city. I can imagine some people would go mad there after the UK it will seem small - but for 120,000 people it has some amazing amenities.
Winters are cold and be prepared for houses NOT being insulated, I am a true Southerner as I hate central heating over here and can't wait to open a window everywhere I go! You just cope by putting on a few extra layers.
Very jealous of you right now!!!!