Tempo

The bard plays a rhythm upon the strings of the weave itself.  The Bard rolls 1d4 and multiplies by 10.  On each turn, the caster counts out that number of seconds.  The current creature's turn ends when the player reaches the count and declares "beat".  Any action not completely resolved is abandoned until the beginning of the creature's next turn where the creature may resume it as that creature's action.  Spells or abilities abandoned in this way still consume the spell slots or ability charges and any expended material components as normal, but a resumed action takes no additional resources. 

The spell ends if the bard skips a beat.