::If you created it, and it's not a derivative work of someone else's material (ie, you copied it, or copied it and modified bits), you have copyright over it and all rights relating to that - you can license it however you choose. 
 ::In this case, it might seem like you just copied the image linked to, creating a derivative work. However, under US copyright law - which is the important one for publishing material on Wikipedia - you can't copyright basic factual information (Feist v. Rural). I strongly suspect that something so simple as "a list of the notes a musical instrument can generate" is basic factual information - there's no creativity in putting those notes together like that. 
 ::If it were an actual piece of music, there would be copyright and creativity issues - but it's just a logical ordering of the notes, rather than an "artistic" ordering. Hope that makes sense, and thanks! (Cutting down the number of fair-use images is a slow process, but every one helps...).  |  |