Wolter Seuntjens, a Dutch researcher best known as an authority on yawning, thought it would be cool to hear the song from the 1960s Batman TV series made with bat noises. He was right! The catch is that most of the noises bats make aren’t audible to our ears. Seuntjens and company had a cool workaround for this, though.
First these ultrasounds were digitally reduced to frequencies that are audible. Then the different batsounds were assigned different keys on a keyboard. On this keyboard - the only real Bat-Organ - Ulrich Seidel played the Batman Theme (Neal Hefti, 1966). The video clip was compiled by Sándor Seuntjens using footage from Batman (film, 1966), Batman (animated television series, 1992-95), and National Geographic (natgeowild.com). [Sándor Seuntjens on Youtube, via Improbable Research]