Normalisr

1. Within Temptation

2449 tracks = 11265 mins.
Originally ranked 1 

2. Nightwish

1645 tracks = 7567 mins.
Originally ranked 2 

3. Paramore

1324 tracks = 4832 mins.
Originally ranked 3 

4. Evanescence

1

1169 tracks = 4539 mins.
Originally ranked 5 

5. The Pretty Reckless

1

1258 tracks = 4298 mins.
Originally ranked 4 

6. Florence + the Machine

1031 tracks = 4209 mins.
Originally ranked 6 

7. Moonlight

2

543 tracks = 2606 mins.
Originally ranked 9 

8. Epica

2

529 tracks = 2433 mins.
Originally ranked 10 

9. Closterkeller

2

510 tracks = 2295 mins.
Originally ranked 11 

10. Guano Apes

3

602 tracks = 2127 mins.
Originally ranked 7 

11. After Forever

1

470 tracks = 2122 mins.
Originally ranked 12 

12. Hey

4

547 tracks = 2023 mins.
Originally ranked 8 

13. Nirvana

447 tracks = 1512 mins.
Originally ranked 13 

14. Myslovitz

328 tracks = 1372 mins.
Originally ranked 14 

15. Sirenia

5

224 tracks = 1164 mins.
Originally ranked 20 

16. System of a Down

1

321 tracks = 914 mins.
Originally ranked 15 

17. Linkin Park

265 tracks = 909 mins.
Originally ranked 17 

18. Delain

3

222 tracks = 891 mins.
Originally ranked 21 

19. Flyleaf

3

279 tracks = 850 mins.
Originally ranked 16 

20. Tarja

2

194 tracks = 840 mins.
Originally ranked 22 

21. Laura Marling

3

259 tracks = 820 mins.
Originally ranked 18 

22. My Chemical Romance

3

228 tracks = 786 mins.
Originally ranked 19 

23. Red Hot Chili Peppers

1

175 tracks = 705 mins.
Originally ranked 24 

24. The Killers

1

163 tracks = 673 mins.
Originally ranked 25 

25. Ania

2

181 tracks = 660 mins.
Originally ranked 23 

26. 30 Seconds to Mars

1

138 tracks = 614 mins.
Originally ranked 27 

27. Iron Maiden

4

97 tracks = 601 mins.
Originally ranked 31 

28. We Are the Fallen

2

139 tracks = 556 mins.
Originally ranked 26 

29. Mela Koteluk

1

133 tracks = 523 mins.
Originally ranked 28 

30. Nosowska

1

113 tracks = 429 mins.
Originally ranked 29 

31. Apocalyptica

2

94 tracks = 379 mins.
Originally ranked 33 

32. Lana Del Rey

2

92 tracks = 363 mins.
Originally ranked 34 

33. Avenged Sevenfold

4

70 tracks = 351 mins.
Originally ranked 37 

34. happysad

2

87 tracks = 330 mins.
Originally ranked 36 

35. Hunter

87 tracks = 323 mins.
Originally ranked 35 

36. Brodka

4

97 tracks = 318 mins.
Originally ranked 32 

37. Farben Lehre

7

104 tracks = 318 mins.
Originally ranked 30 

38. Ozzy Osbourne

63 tracks = 302 mins.
Originally ranked 38 

39. Aerosmith

1

60 tracks = 263 mins.
Originally ranked 40 

40. Deep Purple

5

39 tracks = 254 mins.
Originally ranked 45 

41. Bad Company

2

48 tracks = 198 mins.
Originally ranked 43 

42. KSU

3

63 tracks = 184 mins.
Originally ranked 39 

43. Metallica

5

31 tracks = 172 mins.
Originally ranked 48 

44. Bon Jovi

2

37 tracks = 170 mins.
Originally ranked 46 

45. Green Day

3

51 tracks = 160 mins.
Originally ranked 42 

46. Creedence Clearwater Revival

5

52 tracks = 158 mins.
Originally ranked 41 

47. Joe Cocker

3

28 tracks = 113 mins.
Originally ranked 50 

48. Rise Against

1

35 tracks = 112 mins.
Originally ranked 47 

49. The Offspring

28 tracks = 85 mins.
Originally ranked 49 

  Kasia Nosowska & Czesław Niemen

No artist ID from Last.fm (why?) - try to find this artist on Musicbrainz.