I'm surprised that here are people who love the combination Nightwish/Avantasia/Edguy.
Well.... here we go
1. Nightwish
2. Avantasia
3. Sigur Rós
4. Vangelis
5. Kitaro
The first 3 Coldplay albums are also timeless. The last 4 are pretty bad. That's why I don't count them to my top 5 artists anymore.