'Cool Kids' Band Echosmith 'Memba Them?!

American pop band Echosmith -- made of siblings Sydney Sierota, Noah Sierota, Graham Sierota, and Jamie Sierota –- rose to superstardom when their hit song "Cool Kids" hit the charts back in 2014.

The bop hit number 13 on the Billboard Hot 100 and remains echoing in our heads to this day.