If you want good upbeat music I would definitely suggest someone like Phillip Phillips, he sings folk pop.

Morrissey

Ok, some big names first: Sia, Bruno Mars, Katy Perry and Taylor Swift ( the videoclips of these last two are hilarious. I laugh more than I like the singers!), Ellie Goulding, Tove Lo, Avicii, Carie Underwood, ect.

I like Christian songs, so: Big Daddu Wave, Tenth Avenue North, Hilsong United, Kari Jobe, Lauren Daigle, Unspoken, ect.

About rap, well.... I really don't  know! =)

@Shirleen

Since you find Eminem too agressive, check out those rap/hip hop songs and artists:

Slimkid3 & DJ Nu - I Know Didn't I

Cam'ron - Hey Ma

Kendrick Lamar - i

The Roots - How I Got Over

Brother Ali - Take Me Home

Lupe Fiasco - Kick Push

Let me know if you like them! They're much more "laid back" kind of music than gangsta rap.

how about Shawn Mendes?! He is not a rapper anyway, but his song is easy listening.