The Last of Grinoldy
Because of how our brains were designed, it is incredibly easy to replicate a state of mind through the use of determinable stimuli. Due to the nature of music, it is incredibly effective at activating simultaneous neuron pathways necessary for the replication of previous states of mind you had experienced while listening to that specific piece of music. Therefore, in order to save specific states of mind for future use, you can create a library of mind linked music tracks to play at specific mind states, and eventually the neural link will allow you to reach that specific state of mind simply upon listening to the track. Nearby he's still crying, I won't smile while he's there.