Answers revealed in the comments.
GAME 1
Only three acts, all solo artists, have been credited as a lead or featured artist on a song that hit #1 on the Billboard Hot 100 in 2017 and also a different song that hit #1 on the Billboard Hot 100 in 2018. Name any one of those three artists.
GAME 2
The United Kingdom is (as of November 2018) a member of the European Union but is not and never has been a member of the eurozone. Name any one of the other eight European Union member states that are also not members of the eurozone.
hebspeaks 
Game one answers:
Ed Sheeran
Post Malone
Cardi B
GAME 2 answers:
Poland
Hungary
Sweden
Croatia
Romania
Denmark
Czechia
Bulgaria