automatic chain casting hot key?

[harmonic]

Is ther any way to program a hot key to chain cast without hitting the button every 4 seconds

ex. Im trying to raise my subjugation skill so i must cast lullaby on a gnoll every 5 seconds. Would there be any way to hit a macro or something t?o just make this spell cast non stop without me hitting the key all the time

[Deathbane27]

No automation.