Fart Harmony

There're repairs going on around the office including new radiators, all the old pipes are being changed. I went to take a dump today, and I was a little distracted playing backgammon on my phone. It felt like I was farting, but the sound was so weird. It sounded like pressure being released from a pipe through an open valve, high pitched, no rattling sound at all. It was so unlike a typical fart I had to shift positions to see if it would stop or not. It did. My ass is a one man band, apparently, thank you very much.