It's the default one. I honestly don't even know where the option to change it is because i've never looked.
User CP --> Edit Options --> Number of Posts to Show Per Page Trust me, makes browsing so much easier.
I'm not insinuating that you are. I figured you put the song there so you'd know what page it would be for you anyway.
Guh? Mousey posted a song. Then Verigoat quoted the post with the song in it, and it played twice for me on the same page, so I edited Goat's post to remove the song from the quote. He then changed the edit reason because he's dire like you.