Well, I guess in all theory a mugic can be played at anytime. Though wether it is useful or not at said time should be considered when playing it (No point in playing song of focus right before the turn ends)
Strategy is buying a bottle of fine wine when you take a lady out for dinner. Tactics is getting her to drink it.
Chaotic Insider: Tune in every week for the newest strategies and tactics for the Chaotic TCG