Digital audio (WAV / Redbook Audio / MP3) [5999 music records]
This is music in streamed (digitized) formats, most popular from 1995 till now, with coming of CD-ROMs etc. Generally stored are wave data, CD audio or MP3 format. Size of WAV and CD audio tunes is counted after converting all tunes into MP3s with corresponding bitrate and quality. In my opinion, the best audio tracks have been done between years 1995-1997, when the music was full of fresh melodies and ideas, added with CD-quality recordings. Later the game music often came to ambient game sound background instead of melodies, which damaged listening experience a lot. But there are fortunetely, lot of exceptions. :)

Tracked music (MOD / XM / S3M / IT) [1669 music records]
Tracked music is compatible with most PC and Amiga players. Most popular in 1987-1997, on Amiga and PC, arrangements have been released mostly until 1999.

Sequenced music (MID) [2233 music records]
MIDI sequenced music. Most popular in 1993-1996 in PC games, but MIDI remakes from other VGM tunes are releasing till now.

Exotic music formats for Amiga (Amiga Exotic) [580 music records]
Many games in Amiga have been released in various exotic music formats, which are playable with DeliPlayer, but many of them are playable only on original Amiga. Most popular in 1985-1992.

Commodore 64 music (SID) [1771 music records]
Music generated by Commodore 64 games, most popular: 1983-1990.

SNES music (SPC) [778 music records]
Music generated by Super Nintendo Entertainment System (SNES). Most popular: 1990-1995.

Yamaha AY sounchip music (AY) [483 music records]
Music generated by Yamaha AY Soundchip, commonly used in ZX Spectrum 128 and Amstrad CPC games. Most popular: 1986-1990.

Nintendo NES music (NSF) [600 music records]
Music generated by Nintendo NES Soundchip, commonly used in NES games. Most popular: 1986-1990.

Sega Mega Drive GYM music (GYM) [165 music records]
Music commonly used in Sega Mega Drive (Genesis in US) games. Most popular: 1989-1993.

Game Boy GBS music (GBS) [87 music records]
Music used in Nintendo Game Boy and Game Boy Color games. Most popular: 1990-2000.

» Turbo Grafx-16 HES music (HES)
[No music records in database yet, planned to be added in the near (or far :) ) future]
Music commonly used in Turbo Grafx-16 and PC-Engine games. Most popular: 1987-1990.

» Video Game Music format (VGM)
[No music records in database yet, planned to be added in the near (or far :) ) future]
General format to store Video Game Music data, now used mostly for Sega Master System and Sega Game Gear (though it can be used also for other consoles sound output). Most popular: 1985-1995.

» PlayStation Music format (PSF / PSF2)
[No music records in database yet, planned to be added in the near (or far :) ) future]
General format to store PlayStation 1 and 2 music records. Most popular: 1995-2003.

» Atari XL/XE Music (SAP)
[No music records in database yet, planned to be added in the near (or far :) ) future]
Format similar to SIDs, but this time it stores music data from Atari 8-bit computers. Most popular: 1981-1987.

» AdLib Music (AdLib)
[No music records in database yet, planned to be added in the near (or far :) ) future]
Synthesized PC music format which came just after horrible beeping PC Speaker. :) Most popular years: 1989-1993.

» Nintendo 64 Sound Format (USF)
[No music records in database yet, planned to be added in the near (or far :) ) future]
Emulated music format for Nintendo 64, based on Playstation's PSF format. Most popular years: 1996-2000.

» Game Boy Advance Sound Format (GSF)
[No music records in database yet, planned to be added in the near (or far :) ) future]
Emulated music format for Game Boy Advance, based on Playstation's PSF format. Most popular years: 2000-now.