I am a big fan of the band Rush.  They are a Canadian rock band with Geddy Lee as the frontman.
I've never heard of Rush! What was their most popular song, maybe I've heard it?
I would say Lock and Key is a favorite.  The critics gave it great reviews, calling it a hit single.
Thanks for the recommendation, I'll definitely look it up! Are they a relatively new band?
Oh my no.  The were formed in 1968, and their most popular line up began in 1974.
Oh, I'm way behind! Who was their lead singer?
Geddy Lee, but my favorite band member is the drummer Neil Peart.  He writes most of the lyrics, which are generally philosophical and deep. 
They sound like a band I would enjoy! Are they still making music together? I'd imagine they're getting up there in years!
January 2018 that the band was not going to continue.
According to the RIAA, Rush ranks 86th with sales of 25 million units in the U.S. Although total worldwide album sales are not calculated by any single entity, several industry sources estimated Rush's total worldwide album sales at over 40 million units as of 2017. The group has been awarded 24 gold, 14 platinum, and 3 multi-platinum albums.
Rush has received nominations for seven Grammy Awards. The band has won several Juno Awards, won an International
Lock and Key (Rush song)
"Lock and Key" is a song written, produced and performed by Canadian rock band Rush. It is a promotional single from their twelfth studio album, "Hold Your Fire". The song deals with the theme of every human being’s primal, violent instincts underneath their civil appearance - their “killer instinct”. Critics gave the song liking reviews, with some saying it had quality of a hit single, and would make it on the "Billboard" Hot Mainstream Rock