I've found number of things, that are not directly related to my project, but may be otherwise interesting, thus I want to save them for later here.
http://www.algomusic.com/ - a place to find a Java port of Hierarchical Music Specification Language (HMSL) as well as MaxMSP Common Music Notation object and other projects
http://www.freepatentsonline.com/4526078.html - Interactive music composition and performance system - US patent by Joel Chadabe from 1985
http://www.palemoonrising.co.uk - modular music performance tool developed in SC
http://www.smartmusic.com/ - for education, not really performance - auto accompaniment tools and learning environment - putting couple well-known ideas together looks pretty impressive; developed (at least partially) by Roger B. Dannenberg - Associate Research Professor at School of Computer Science and School of Art, Carnegie Mellon University (Pittsburgh, PA)
http://www.cs.cmu.edu/~music/nyquist/ - another audio-oriented programming language (associations with Lisp) (used by R. Dannenberg)
http://dx.doi.org/10.1080/07494469100640121 - arcticle by Jerry Hunt on his live electronic systems - kind of historical (1991) (available only from UW campus I believe)
http://thebeamz.com/ - interactive music system for general public - I think I might buy that one day for my little sister (simple and working concept of pre-prepared samples triggered in real time)
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.14.3389&rep=rep1&type=pdf - "Interactive Music Systems For Everyone" by Sergi Jordà - some information on Reactable
http://www.mitpressjournals.org/toc/comj/30/1 - Computer Music Journal, Spring 2006; Article Toward a Framework for Interactive Systems to Conduct Digital Audio and Video Streams provides some insight on tap-input synchronization, which I was exploring a while ago
http://davidlitke.net/davidlitke/research.html - score following/interface in Max/MSP and NoteAbility Pro
