Also known as: E-reader, e+ (JP; Doubutsu no Mori e+ edition)
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Scan Dot Code.
The e-Reader was a card-powered Game Boy Advance add-on that let users scan dot codes to play classic NES games, mini-games in Mario Party-e, get info and play mini-games from Pokémon-e cards, and access some fun stuff in various GBA and GameCube games.
e-Readers came bundled with two packs: an NES game (either Donkey Kong Jr. or Pinball), and a "sample pack" of Manhole-e, an Animal Crossing-e card, and three Pokémon-e cards (Machop, Machoke, and Machamp).
Unfortunately, the e-Reader failed in North America and Australia, resulting in a planned Game & Watch-e Collection line being shelved (scans of the released promotional material can be seen here). That said, the e-Reader did flourish in Japan, being supported until the end of the GBA's lifespan. Europe never even got the thing.
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There are tons of unused songs within the BIOS since the Animal Crossing-e cards, Mario Party-e minigames, and Pokémon-e cards don't contain their own music.
GameShark code 02029436???? (where "????" is the song number) will play any song anywhere.
For the Mario Party-e minigame "Balloon Burst", an early version of the Wario balloon is loaded into VRAM alongside the used one. The unused version is one pixel smaller on all sides and has a less tense expression.
Present at offset 0x5F378C in the US ROM is this line of text, presumably some unused debugging text:
A short signature tune of Kazumi Totaka's, hidden in almost every game he has composed music for. In this case, getting the song to play requires one of two specific cards from the Animal Crossing-e series: card P-13 or P-15 of Series 4, both of which contain the minigame "Who's Dunnit?", where the background music contains Totaka's Song on a loop.
As noted above, the music is stored in the e-Reader BIOS rather than in the dot codes.