What is the song in episode 9 at 5:26? What is the song that starts playing at 5:26 of Fairy Tail episode 9?
As you haven't specified I'll assume you meant episode 9 of the first series.

It's Fairy Tail's take on Can Can, which is part of the Overture of Orpheus in the Underworld by Jacques Offenbach

You can find the whole song here