Answer:
Vocal solo
( usaully is a section or piece sung or played by only one performer.)
Duet
( And a duet is a performance of 2 people, especially singers, instrumentalists, or dancers.)
Explanation:
Remember in a Vocal solo, it maybe accompanied by instruments but the vocals are solo or theres only one voice performing alone! And in Duet, 2 persons are usually found performing, it maybe be accompanied by instruments as well but between the Duet and Solo, Duet has 2 partners performing and in Vocal Solo, its only a solo performance.
Hope this helps <33
