Compose a piece of music using the specified letter-based musical form and incorporating the assigned motif.
X:1
L:1/16
M:4/4
K:Ab
['[CE]4 [=B,=D]3 [_DF] [CE]4 [EA]2 [E=B]2 [Ec]4', '[Fd]8 [Fd]8 [Ec]8 [Ec]4 [EB]3 [EB] [=DB]4']  
X:1
L:1/16
M:4/4
K:Ab
 [CE]4 [=B,=D]3 [_DF] [CE]4 [EA]2 [E=B]2 | [Ec]4 [Fd]3 [FA] [Ec]8 | [Ec]4 [DB]3 [DE] [DB]8 | 
 [CB]4 [CA]3 C [CE]8 | [CE]4 [=B,=D]3 [_DF] [CE]4 [EA]2 [E=B]2 | [Ec]4 [Fd]3 [FA] [Ec]8 | 
 [Ae]4 [Ec]2 [CA]2 [DB]4 [DE]2 [DB]2 | [CA]12 z4 ||"^Refrain" [FA]8 [Fd]8 | [Fd]8 [Ec]8 | 
 [Ec]4 [EB]3 [EB] [=DB]4 [Ec]2 [A=d]2 | G4 A4 B4 z4 | [CE]4 [=B,=D]3 [_DF] [CE]4 [EA]2 [E=B]2 | 
 [Ec]4 [Fd]3 [FA] [Ec]8 | [Ae]4 [Ec]2 [CA]2 [DB]4 [DE]2 [EB]2 | [CA]12 z4 |]  