Most listened to artist

No order and just the most often listened to in my lifetime:  Milstein, Heifetz, The Los Angeles Jewish Symphony (live), Shelly Manne (in jazz combos), Jan Peerce (opera and liturgical), Ruth Etting, Leonard Pennario, Sinatra, Ella Fitzgerald and Claudia Muzio   

While they are still all favorites, I have 100s more favorites that I listen to regularly.  Sinatra is ubiquitous and heard everywhere.  Manne in jazz is the same in small jazz combos.  Music is my avocation.  I have 61,100 LPs/CDs/78s/R2R recordings in my collection and listen 2 hours minimum nightly.  I certainly have heard Hal Blaine and the wrecking crew all the time with their possibly 10,000 recordings/backing for film and recordings, who hasn't that is a baby boomer? 

To  all Bach i must add the 8th book of madrigals by Monteverdi ...Schutz Geistliche chor music ...Vivaldi...

I listened each one of these 4 composers 1,000 times at least ( counted it for Monteverdi)  for 60 years...

Only one "popular" singer i listened as much , it was Léo Ferré three albums dedicated only to poetry by Baudelaire, Rimbaud and Verlaine ...

I’m really late to this party, but I have enjoyed reading almost every post and have found several groups I had never heard of. Being over 65, my list mirrors a lot of what has already been posted, but I can add to the list.

Rare Earth

CCR

Steppenwolf

Herb Alpert

Ornet Coleman

BB King

Simon & Garfunkel 

CSN & sometimes Y

The Yellowjackets

Glen Miller 

Mannheim Steamroller 

Jean-Pierre Rampal

Hi Here's the list of artists who received at least 4 votes (the leader was Pink Floyd with 18 votes). The list goes, in order, from highest to lowest votes received.

Pink Floyd, The Beatles, Led Zeppelin, The Rolling Stones,

Dire Straights/Knopfler, Steely Dan, The Greatull Dead, Miles Davis, Yes, 

Talking Heads, Joni Mitchell, The Who, David Bowie, The Eagles, John Coltrane,

Allman Brothers, Neil Young, Bob Dylan, Fleetwood Mac/Nicks, The Band,

King Crimson, Jimi Hendrix, Elvis Costello, Peter Gabriel, Tom Petty, Keith Jarrett,

The Cure, U2, Bruce Springsteen, J. S. Bach, Mahavishnu Orchestra/J. Mclaughlin,

The Clash, Jethro Tull, Jeff Beck, CSNY, Genesis, VanHalen, Bill Evans, Bob Marley,

Natalie Merchant/10,000, Frank Zappa, Lynyrd Skynyrd, Clapton/Cream/Derek

No need to list a dozen music acts if you carefully break it down. It’s a toss-up for me between Led Zeppelin or Van Halen if you also consider FM radio. Would be impossible to accurately(for me) list ten artists