HitClips were tiny digital music cartridges introduced by Tiger Electronics around 2000 and aimed primarily at children and teenagers. Instead of complete songs, each cartridge contained only about one minute of low-quality mono audio, featuring popular artists such as Britney Spears, NSYNC and the Backstreet Boys.
The AMOS TastySounds Audio Lollipop combines an edible lollipop with a tiny electronic audio system containing pre-recorded music. Instead of using a conventional speaker or headphones, it transmits sound through the teeth and jaw by bone conduction — allowing the listener to literally hear music while eating the candy.
The Yaboom MCD Musical Key Chain was a miniature digital music player introduced around 1999. Each keychain contained a pre-recorded full-length song stored electronically in ROM, combining the music medium, player and keychain into a single tiny device.
The Yaboom Box was an unusual digital music system from around 1999 that used interchangeable ROM cartridges containing pre-recorded songs. Released just before MP3 players became widespread, it represents a brief period when manufacturers experimented with dedicated solid-state music formats instead of conventional tapes or discs.
Disney Mix Clips were pre-recorded memory cards introduced in 2005 for Disney's child-oriented Mix Stick and related portable media players. The cards contained complete digital music tracks and used standard MMC or SD technology, meaning that the seemingly proprietary music format was actually based on familiar flash-memory cards.
USB flash drives occasionally served as commercial music distribution media, offering albums or special releases as digital audio files stored directly in flash memory. Unlike most proprietary formats, the music could be accessed using an ordinary computer without requiring a dedicated player.