An electronic music speaker, amplifier or sound system.

Speaker

A person sitting down, with his computer and headphones, participating in an online class, watching a movie or listening to music.

Person With Laptop And Headphones

A standing person wearing professional attire while extending an arm.

A round retro vinyl or a CD with a hole in the middle to play music. 

A medical professional standing with a stethoscope around their neck.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.