: Unlike Lesson 01 and 02, which were standard MIDI files and PDFs of sheet music, pionalesson03.rar was password-protected. The "read-me" file included with it contained only a cryptic string of coordinates and a date.

: Those who managed to crack the password (reportedly the name of a missing music student from 1994) found a single, high-bitrate audio file. It began with a simple C-major scale played on a slightly out-of-tune upright piano.

: The file first appeared on obscure file-sharing forums and early 2000s BBS boards. It was often buried in directories alongside legitimate piano tutorials, making it easy for unsuspecting music students to download.