The Humdrum Toolkit
The Humdrum Toolkit is a suite of software tools for UNIX-like systems intended to assist in music research. The toolkit is suitable for use in a wide variety of computer-based musical tasks. Humdrum is no longer actively supported by the Cognitive and Systematic Musicology Laboratory.
The official Humdrum website is no longer actively maintained. The most current Humdrum Resource is the CCARH Humdrum Toolkit Portal, hosted by the Center for Computer Assisted Research in the Humanities at Stanford University. Also cropping up has been the Humdrum Wiki.
The most active and reliable source for Humdrum support is the **HUG: Humdrum User Group hosted by Google Groups.