Rez is a unique synthesizer program for the Nintendo Gameboy by nitro2k01. It crudely simulates a resonant filter in a way inspired by the resonance algorithm used by the Casio CZ series phase distortion synthesis. It can both produce sounds meant to emulate this effect, and sounds more reminiscent of a hard sync oscillator. It also produces a graphical pattern on the Gameboy screen.

Source via NESdev.

http://blog.gg8.se/wordpress/2012/12/11/rez-a-unique-gameboy-synth-rom/

Demon Blood by Youth Uprising is an invitation intro for @party 2012, released at Pixel Jam 2012.

http://pouet.net/prod.php?which=59196

Cenotaph by DCS is a Revision 2012 demo, ranked #4 in the oldskool demo competition.

http://www.pouet.net/prod.php?which=59139

Snorpung, known from his previous Gameboy Classic Demos “20 Years” and “Oh!”, has released another Demo named “Gejmbaj”. Gameboy Classic Power in 2010!

http://pouet.net/prod.php?which=56367

XPMCK is a music (expressed in MML) compiler kit targeted towards various video game systems. It currently supports the following systems:

Capcom Play System (VGM output only)
ColecoVision
Commodore 64
MSX (KSS output only)
Nintendo Gameboy / Gameboy Color
SEGA Master System
SEGA Game Gear
SEGA Genesis

Besides the compiler and its source code, the kit includes playback libraries for all supported systems, as well as examples and brief documentation.

Changes:

* Added a transpose command.
* Added support for per-note macros.
* Fixed a bug in the handling of [] loops in the Gameboy and C64 playback libraries.
* Fixed a bug that would occur when the initial delay in an @MP macro was zero.
* Fixed some bugs in the compiler which would result in some AY-specific commands being ignored when outputting for the Amstrad CPC.
* Step values for intervals are now automatically given the correct sign by the compiler.

http://jiggawatt.org/muzak/xpmck/

The Original Pixelh8 Music Tech Game Boy Synthesizer is software that runs on an unmodified Game Boy or Game Boy Advance, enabling you to be able to control the game boys on board sound. You can edit the wave duty, pitch sweep and volume envelope as well as new additions such as unison, 5th power chords and octaves, turning the Game Boy into a real time instrument.

http://pixelh8.co.uk/download/

A very simple 16-step drum sequencer with eight different drum sounds. Originally designed for use in chip tune workshops. It was designed for for children ages 6-8 to learn the basics of sequencing on a familiar interface.

http://pixelh8.co.uk/download/

The Original Pixelh8 Death Ray Noise Generator is a software running on an unmodified Game Boy, enabling you to be able to control the GB’s board sound.

http://pixelh8.co.uk/download/

Oh! by Snorpung is a demo for the classic b/w/greyscale Gameboy!

http://www.pouet.net/prod.php?which=54175

Man meets machine is an invitro for the demoparty “Alternative Party 2009”, coded by the guys from Jumalauta.

http://www.pouet.net/prod.php?which=53578