JapanForum.com - Punctuation/typography question

I am tagging and organizing my music collection. I am rather obsessive compulsive about filling in every little tidbit of information within the data fields. I have a method for handling artist from countries who do not use Latin scripts. First, I enter the artist's name in his or her native language and script. Then next to that, I well place it's romanized form. This method serves me quite well. However, I have a couple of questions about how to handle situations were more than one artist or composer is involved.

1) When two or more, artists, writers, composers, are involved is it more accepted to list them as:

初音ミクと巡音ルカ

or as

初音ミク・巡音ルカ (with the nakaguro ... aka interpunct)

In my head, it should be the former instead of the later. However this may just be my western way of thinking. Typically in English, two items do not make a list and you would not use punctuation to separate them.

2) When listing multiple persons whom are of equal importance, is there a preferred order to list them? In English you would typically list them according to alphabetical order of their surnames.

Applying the same sort of methodology to Japanese I would think the normal order would be:

初音ミク・巡音ルカ instead of 巡音ルカ・初音ミク because it is my understanding that the "ha" phoneme should come before the "ma" phonem. Then again I maybe thinking too western again.

Now I realize this a trivial thing, in the grand scheme of things. But for some reason not knowing this is driving me a bit insane. I've searched for the answer on the web in vain. Hopefully someone here has spent enough time in a Japanese library to give me a little insight.