m@3: (cl:in-package #:amuse) 
m@3: 
m@1: ;; basic musical object classes
m@1: 
m@1: (defclass composition ()
m@1:   ())
m@1: 
m@1: (defclass event ()
m@1:   ())
m@1: 
m@1: (defclass pitched-event (event)
m@1:   ())
m@1: 
m@1: ;; pitch-related classes
m@1: 
m@1: (defclass pitch ()
m@1:   ())
m@1: 
m@1: (defclass chromatic-pitch (pitch)
m@1:   ())
m@1: 
m@1: (defclass diatonic-pitch (pitch)
m@1:   ())
m@1: 
m@1: (defclass frequency (pitch)
m@1:   ())
m@1: 
m@1: (defclass interval ()
m@1:   ())
m@1: 
m@1: ;; time-related classes
m@1: 
m@1: (defclass moment ()
m@1:   ())
m@1: 
m@1: (defclass duration ()
m@1:   ())
m@1: