A Gosick character song and drama CD came out June 1, featuring four mini-dramas and songs by Eguchi Takuya (Kujou), Shitaya Noriko (Avril), and Yuuki Aoi (Victorique).
I have to say I am amazed at how good Ao-chan's singing is. I know it must have some technical post-production to keep it in tune, but her voice is very exposed and she gives the song some nice little touches. Who knew? She especially seems to understand the dramatic movement of the song.
The CD includes both this and an off-key version of the song, like the one Ao-chan did in episode seven.