Sorry to be late to the party on this one but, I have a standard I use here for disambiguation that works pretty well for me and I've spent a lot of time splitting out artists here.
5 points of information usually in this order
2. Location the artist is associated with (country/well known city.etc)
4a. - For groups: grouping details (don't know how to name this) - band, or duo or trio or choir or collective or group (what fits best with those)
4b - for individuals primary roles/instruments anything from vocals or specific instrument or producer or engineer or graphics etc.
5c - wild card - if the artist has a specific noteriety or signature song or label, or real name, or notable band member or alternate name or person they worked with
00s UK post-rock trio "signature song"
60s-70s Manhattan folk singer/songwriter
A major factor is that you only include information from as many number as you know, the rest can be filled in as required or known
When you have 2 remarkably similar artist (where more than 1 of their numbers are known, it may be best to focus on just the numbers where they differ.
I hope you can understand my ramblings here that are perfectly sane in my head and a lot easier to do than explain i'm afraid, but its about time i start writing some of this down.