Q: "A group of young musicians." Does this mean that "A group of young jazz performers"?
A: it is not possible to tell

Q: "A man in a blue shirt is singing and playing guitar on a stage in front of a drummer." Does this mean that "A man is performing with a drummer."?
A: yes

Q: "Students are sitting lined up on stair steps while they wait and check their electronic devices." Does this mean that "Some people are seated in order and are looking at things in their hands."?
A: yes

Q: "A little girl in a pink dress is being held by a woman who is on her cellphone." Does this mean that "A grandmother holds her granddaughter, who is holding a pink toy phone."?
A:
no