Rhythm: the rhythmic pattern of a poem.
Instrument:
A.Iamb (iamb): IAMB = unstressed+stressed.
B. Anode sound = stress+unstressed sound
C.Anapest (anapestic): iambic inhibition = 2 unstressed+stressed
D.Dactyl (dactylic): up and down = stress +2 unstressed.