As BP says - part of the downside with hosting using your ISP is that they might restrict the traffic allowed.
One, Plus.Net, has a daily limit of 250 MB (which is quite generous - 10 GB total each month) but it only needs a bunch of friends to mention her website the same day on FaceBook or MySpace and if the amount of downloading takes the traffic level over 250 MB, the website would be 'suspended' (so no more visitors would see/ hear content).
I think 123-reg.co.uk has a deal going for students, charging them 1 pound per month for hosting.
If she classes the music as 'business' the www.gbbo.co.uk (Getting British Business Online) - a collaboration of firms including Google and BT - is offering a .co.uk domain name of your choice and free Google Sites web hosting, ALL FREE. After 2 years there would be a renewal fee for the domain.
I have used Google Sites (it was a free option on the control panel of one of the domain registration services I use) and it does allow user editing / creation of the web pages, with their own sample templates etc.
Using GBBO would ensure the site was listed with Google (the most popular search engine in the UK {... unfortunately ... it gives them too much clout IMO, and is exacerbated when people say to 'google it' instead of 'search for it'}).
It should be possible to get creating free on Google Sites, and then if she wants, get more adventurous and design pages with different graphics, and promote them separately. The Google Sites pages could link to YouTube video, allowing the cost of the downloading to be avoided.
One downside with using Google Sites would be the difficulty in tracking visitors. It would perhaps be worth adding links to MySpace and so on, so she can have some other content (outside the control of Google Sites templates) and allowing her to have 'friends' (or with Twitter, followers) to be able to market herself, and perhaps sell MP3 copies of live sessions (if she wants to go down that route).
If she went for a full webhost / webdesign situation, and had downloads etc, then she could find it more of a drain on funds than bringing them in. It's unfortunately very easy for some of the traffic (downloading) costs to end up with the site owner, before they get anything coming in from the artistic works... IYSWIM HTH