I am thankful for the power of music, for the rise and fall of the rhythm as the measures march on. The crescendos and the decrescendos, the feeling behind the words or the harmony or even just the simple notes of the melody. With lyrics or with just sounds of the instrument, it is a language all on its own and it is full of emotion.
Check out the original Thankful Thursday. (I will update the link when able.)
EDIT: Link updated as of July 18, 2015.