Build a Better Music Interface: Railfans (as in Trains)
Railfans are building life-size, full-scale railroad cabs that look and function like the real thing, then projecting scenery onto their wall. And for music, you can hack their USB controller to turn it into a music / video / VJ controller, using either the Windows SDK (for hard coding) or a Mac app called junXion (for simple MIDI, useful with Max/MSP/Jitter, audio and VJ apps etc.) Aside from the train controller interface, you could use their I/O box to build any controller you wanted. There are other I/O boxes that use USB, but theirs has an unusual number of ins and outs, saving you basic stamp programming. And it’s also comparatively cheap. They also make bunches of custom controllers, keyboards, everything… Link.
Yes, it is possible to broadcast music, MP3’s, Podcasts, etc. from your itunes, computer cd or whatever. Don’t limit yourself to a boring microphone… share your music! 
Arimaa is the first game designed specifically to be hard for computers to play, while easy for people. With its billions of combinations and push-me-pull-you gameplay conditional value strategy, it’s too much for brute force computing. And yet, it’s simple enough for a child to play [
NPR_Nut writes “A group of musicians took centuries-old instruments from the forests of Congo, brought them into the city – and plugged in! Their do-it-yourself amplification devices conjure up garage bands. African punk music from Konono Number One.” 
Master chip musician Gijs Gieskes has outdone himself this time: his second Walkman tape sequencer controls the Game Boy music cartridge LSDJ via various knobs and circuitry. In other words, the sequencer he built controls both a Walkman tape deck and a Game Boy. Check out this audio sample or this one to hear what all this sounds like. The effect is quite brilliant: a madcap tape deck scratch system with Game Boy music. Forget records and turntables. Tape is the future, man. 
The term “mash-up” or “bootleg” (or, more commonly, just “boot”) describes the result of mixing together two or more records to create a whole new track. Though originally performed live using turntables and DJ mixers, recent advances in sequencing software have taken this art-form to a whole new level. This document outlines how mash-ups can be made using the software package Tracktion. 