Audacity® is free, open source, cross-platform software for recording and editing sounds. Audacity is available for Windows®, Mac®, GNU/Linux® and other operating systems.
An OS 9 odyssey: Why these Mac users wont abandon sixteen-yr-o
Operating System proficiency includes: Mac OS 9 and Windows
My coworkers made me use Mac OS 9 for their (and your) amusement | Ars Technica