Another interesting etymology. This word comes from the Greek for leading or guiding.
agogic, a.
1. Of or pertaining to modelling in wax.
2. Mus. [G. agogik (Riemann 1884).] Applied to a kind of accent consisting in a lengthening of the time-value of the note. Also agogical a. So agogics, the use of agogic accents.
Neh 