Mashing Pictures through metadata

As a flickr user I add metadata to my pictures as much as I can. There's three way to achieve that on flickr (well four when you include geotagging). Using a title, adding some description on what the picture is about, and tagging. Tagging is the easiest way to describe a picture with a few simple word. You add keywords to you pictures when you tag them. Some of these tags are a bit specila as they may link your pictures with other websites or with data that does not reside on Flickr itself. Flickr uses special tags called machine tags - with these you can link to events that are posted on the upcoming service by yahoo or with concerts that are annonced on last.fm, tagging enhances the content and makes it findable. There is probably more use with other sites but I don't know it.

While I was on vacation in greenland and ended up in a concert in a bar in Ilulissat.I took a few pictures and really liked how the guys were performing. So I asked them if I could buy a CD to which the answer I was given a small piece of paper was an URL. Url Which I ended visiting and buying the their unique album which to my surprise dates from the beginning of the 90's.

I imported the CD into my music collection and started playing it - as I'm a last.fm user I had a look at the data that last.fm maintained on "Unnuaq Band". It was quite empty so I made the first two versions of the wiki page added a scan of the group's logo that I took from the album. Actually I needed to add wiki information before the upload of the scan was taken into account by last.fm's software. Then I made sure that the group was connected with the Greenland group.

After two weeks of playing the band's song I looked at my stats on last.fm and was suprise not to see the album name in what I was playing. So I kindly ask on the forums where the data came from, and the answer was musicbrainz. From time to time, last.fm synchs it's data from Musicbrainz. So I created an account and started adding data about the album. Using the taggers provided by last.fm did not do much because the music was unavailable on musicip. So I gave musicip a look and would have done sampling with Music IP if their software supported my os :
Thank you for visiting musicip.com. A Mac version of the iTunes plug-in is
planned but not currently in development. If you sign up for our beta testing
program you can be one of the first to try out the new plug-in.

Let me know if you have any further questions.

So I can't provide all the data/metadata, and need to do that by hand, at the moment but will probably do.

So I'm having fun these days figuring out how I will tag my picture when I'm going to upload it to flickr. Shall I use machine tags like lastfm:band= or should I create musixbranz:MBID=, shall I use both ? I would rather use the later, so all sites using musicbrainz's data would benefit from my tagging and could, if wanted show my flickr pictures on their website.
Now I don't mind adding more than one tag, but was wondering what the best approach would be. Ideas, comments welcome.