Auto-tune sites are websites that allow users to modify their audio recordings with a variety of effects, such as pitch correction and vocal effects. The term 'auto-tune sites' is often used to refer to the popular online music production platform, GarageBand. GarageBand is a digital audio workstation developed by Apple Inc. for macOS and iOS devices, which allows users to create music or podcasts. It includes a wide range of virtual instruments, sound effects, and other audio editing tools.