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

Envelope attached to the string of a floating balloon.

An identity card or document with a picture of a person, a barcode and three lines of text and a small hanging string.

A wall calendar hanging with a string and nail.

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

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