The song is indeed directed to Jeffrey Hammond, though I believe it was meant to be a parting song. Before Tull was formed, both Anderson and Hammond were part of a group called The John Evan Band (or Smash). As you may guess, that group also had future Tull keyboardist John Evan. Anyway, after the group broke up, Ian formed a new group that eventually became Jethro Tull, while Hammond wanted to study art. One can assume Jeff was trying to talk Ian out of the music scene, and this song is Ian's reply.
The song is indeed directed to Jeffrey Hammond, though I believe it was meant to be a parting song. Before Tull was formed, both Anderson and Hammond were part of a group called The John Evan Band (or Smash). As you may guess, that group also had future Tull keyboardist John Evan. Anyway, after the group broke up, Ian formed a new group that eventually became Jethro Tull, while Hammond wanted to study art. One can assume Jeff was trying to talk Ian out of the music scene, and this song is Ian's reply.