Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/4
M:4/4
K:Ab
['[Ec] [Ec]']  
X:1
L:1/4
M:4/4
K:Ab
 [Ec] [Ec] [Ec]/>[DB]/ [CA] | [DB] [DB] [DB]/>[DA]/ [DF] | [CE] [CE] [CA]/>[B,G]/ [CA]/[DB]/ | 
 [Ec] [Ec] [EB]2 | [Ec] [Ec] [Ec]/>[DB]/ [CA] | [DB] [DB] [DB]/>[DA]/ [DF] | 
 [CE] [CE] [CA]/>[B,G]/ [CA]/[DB]/ | [Ec] [DB] [CA]2 | [Ec]2 [CA]2 | [FA]2 [DF]2 | 
 [CE] [CA]/>[DG]/ [EA] [EB] | [Ec] [Ec] [EB]2 | [Ec]2 [CA]2 | [FA]2 [DF]2 | 
 [CE] [CE] [CA]/>[B,G]/ [CA]/[DB]/ | [Ec] [DB] [CA]2 |]  