Carillon strike the inside of the bells, allowing the performer on the bells, or "carillonneur/carillonist" to vary the intensity of the note according to the force applied to the key. Although unusual, real carillons have occasionally been fitted to theatre organs (instead of the metal bars or chimes more often used in simulation), such as the Christie organ installed at the Regal Cinema, Marble Arch, in London. A carillon-like instrument with fewer than 23 bells is called a chime. The carillon is the second heaviest of all extant musical instruments, only ranking behind the largest pipe organs. The heaviest carillon in
A Ghost Is Born the coda of "At Least That's What You Said". Tweedy refers to the guitar solo at the end of the track as a "musical transcription" of one of his panic attacks. "A Ghost Is Born" was recorded in a manner different from "Foxtrot" or 1999's "Summerteeth"; whereas those recordings were performed live in the studio and then overdubbed, "A Ghost Is Born" was first performed on Pro Tools and only played live once completed. Tweedy was excited about writing an album this way: An unusual feature of "A Ghost Is Born" is the fifteen-minute long track "Less Than You Think".