Final answer:
An aria is the correct term for a song for solo voice with orchestral accompaniment, often featured in operas and designed to showcase the soloist's vocal abilities.
Step-by-step explanation:
The term that describes a song for solo voice with orchestral accompaniment is an aria. An aria is typically found within an opera or oratorio and features a solo singer who expresses a character's emotions and thoughts through a clear melody. The orchestral accompaniment often provides a rich backdrop that enhances the soloist's performance but does not overshadow the voice.
In contrast, a sonata is a composition usually for a solo instrument or a duet, without vocal parts. A concerto is a musical piece where a solo instrument is accompanied by an orchestra, and an overture is an introductory music piece for an opera or a ballet but does not involve solo singing.