Clara's theme from series 7 of Doctor Who composed by the fantastic Murray Gold. It's not the whole thing and I didn't arrange it either. I found a PDF online for two piano's and wrote it for just the one. :)
I like this arrangement. One small note though, Impossible Girl is a separate song in the soundtrack, this is Clara's Theme, which you call it in the description, so the title might cause confusion for people looking for Impossible Girl.
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