So, I'll mention 104 of my Top Artists of all time and the country they come from. Then we will see what country is the best or not.
United States: Britney Spears, Madonna, P!nk, Vanessa Carlton, Mariah Carey, Felix da Housecat, The White Stripes, Jennifer Lopez, Fergie, Jessica Simpson, Maroon 5, Stacie Orrico, Ashlee Simpson, Kelly Rowland, Carrie Underwood, Gwen Stefani, Moby, Jewel, Aimee Mann, The Killers, !!!, Garbage.
[21.15%]
United Kingdom: Goldfrapp, Amy Winehouse, Girls Aloud, Client, M.I.A., Pet Shop Boys, MIKA, Depeche Mode, Sophie-Ellis Bextor, Sugababes, Mark Ronson, The Pipettes, The Chemical Brothers, Radiohead, Lily Allen, Natasha Bedingfield, Siobhan Donaghy, Sarah Brightman, S Club 7, Arctic Monkeys, Ladytron, Duffy.
[21.15%]
Ireland: Róisín Murphy, Eddie Reader.
[1.92%]
France: Emilie Simon, Daft Punk, Justice, Alizée, Myléne Farmer, Emily Loizeau.
[5.76%]
Australia: Kylie Minogue, Sneaky Sound System, Midnight Jugernauts, Delta Goodrem, The Veronicas, Dannii Minogue, Holly Valance, Darren Hayes, Blue King Brown, Dead Can Dance.
[9.61%]
Iceland: Björk, Amiina.
[1.92%]
Canada: Dragonette, Sarah McLachlan, Metric, Alanis Morissette, Feist, Justin Nozuka, Avril Lavigne, Nelly Furtado.
[7.69%]
The Netherlands: Within Temptation, Epica.
[1.92%]
Mexico: Belanova, Sweet Electra, Julieta Venegas, Fase.
[3.84%]
Japan: Utada Hikaru, Ayumi Hamasaki, Momoe Yamaguchi, Ai Otsuka, Ayaka Hirahara, Chihiro Onitsuka.
[5.76%]
Finland: Brightboy, Nightwish.
[1.92%]
Norway: Röyksopp, Annie.
[1.92%]
Russia: t.A.T.u., Regina Spektor.
[1.92%]
Barbados: Rihanna.
[.96%]
Sweden: Robyn, The Sounds, Jessica Folker, ABBA.
[3.84%]
Spain: Luz Casal.
[.96%]
Germany: Monrose.
[.96%]
Colombia: Shakira.
[.96%]
Brazil: CSS.
[.96%]
Argentina: Soda Stereo.
[.96%]
A tie between US and UK then
... i see Shaki 
... i guess no cam to cam 
. I thought the lead singer was Scottish