>>532798326
I also like the music in Automne the most. Not all the tracks are on the 'tube, by the way.
For me, my favourite vocal track is Niji no Mahou. But yeah, Chidorin's song is great as well. You should've already heard it in the drama CD, but the Ete OP as a duet with both Erika-chan and Chidorin is also great.