Paramore, Nickelback, Fall Out Boy, The Fray, etc.
For me the best Singers are Natalia Szroeder and Ariana Grande. I also like voice of Jessie J.
"Bang Bang ...♪"
Ellie Goulding and Avicii. I also like Sonata Arctica and older Nightwish :P
Occasionally I listen to bands like Fall Out Boy, U2, Sleeping With Sirens and Panic! At the disco. I used to listen to these bands all of the time before I started listening to kpop. 
5sos.. some ATL, Biffy Clyro, Ed Sheeran, FOB, Hinder, Joseph Vincent, Kodaline, Owl City, Sleeping with Sirens, 21 Pilots
At the moment, it's Twenty One Pilots. 
(Queen and My Chemical Romance are my favorites as well)
nirvana, bmth, rhcp, pvris, 21pilots, lana del rey, justin timberlake, placebo, crystal castles etc
Anthem Lights, Britt Nicole, Tori Kelly, Ed Sheeran, Il Volo
Crown the empire
pvris the amity affliction northlane
Bands:
- All Time Low
- Paramore
- The Maine
- Fall Out Boy
- The Script
- Maroon 5
- Panic! at the Disco
- The Fray

Single:
- Melanie Martinez
- Marina and the Diamonds
- Lana Del Rey
- Lily Allen
- Rachel Platten
- Taylor Swift
- Troye Sivan

and many more lol I'm not updated with the new ones because I'm into kpop but yeah ~
Justin Bieber, One Direction (i also like them solos) , Tokio Hotel, Maroon 5,... 
Hmm, i don't listen to it alot, but i recently started to listen to the dutch band The Deaf again :)
no one particular favorite, just a select number of bands I've liked for a good number of years: the smiths, the cure, foals, the killers, franz ferdinand, white lies, & the cinematics + the newer additions of joywave & woodkid. 
Kehlani / The Weekend / Mansionz / Jojo