Answer:
Part of a compound subject.
Explanation:
Let's first explain what these terms mean.
1. A compound subject consists of at least two subjects joined by a conjunction (usually the word and). As you can see in this sentence, that is exactly the case - both Jewel and Lauryn Hill.
2. A compound predicate, similarly to a compound subject, contains at least two predicates joined by a conjunction: sings and dances. There is no compound predicate here because are known is a simple predicate.
3. Direct object is what the subject is performing an action on: She is writing a book.
4. Indirect object is the other object, the one which is not primary/direct: She gave me a book.