It is meant to be a stand alone program, but it could also be used as a library if someone wants the same functionality as part of a larger program.
Hi, If triads is supposed to be used as a standalone program and not as a library, it may be better to remove "cl-triads" and "ecl-triads", and to rename "sbcl-triads" to "triads" and move it to "music.scm".