I see that the jTab guitar tab plugin has been introduced at music.se now as it was on guitars.se, which I think is brilliant. But it should perhaps be only applied for questions tagged [guitar]. I just posted an answer to a Harmonica question, where I needed applied note names in a monospace font, and was converted to guitar tabs when I added. I had to simulate the spacing to get it work without code section.
Example of jTab kicking in, although I don't want it to be:
C D E F G A B C out in out in out in in out
Instead I had to do some hacking using the block quote format, and add some
to align the spacing to an approximate:
C - D - E - F - G - A - B - C
out in out in out in in out
On StackOverflow, the programming language to use for code coloring is based on the language specified in the question tag ([C++], [C#] etc. use C encoding. [VB6], [VB.NET] etc. use VB encoding and so forth).