Top 10 Songs with the Best Rock Singer Collaborations

Songs where rock / metal singers sing with singers from other bands or solo artists.
Singers from bands with two lead singers or backing vocalists from the same band don't count.
Guest apearances, side-projects and supergroups are OK.

At least one of the singers has to be a rock or metal singer but collaborations may include singers from other genres - opera, pop, rap, jazz, blues, ...

The Top Ten

1 Barcelona - Freddie Mercury & Montserrat Caballe

"How can I go on" is almost as good as Barcelona.

2 Age of Shadows / We Are Forever - Ayreon

Vocals (8 great singers):
Jørn Lande, Floor Jansen, Hansi Kürsch, Daniel Gildenlöw, Anneke van Giersbergen, Jonas Renkse, Steve Lee, Tom Englund. - Metal_Treasure

3 All for Love - Bryan Adams, Rod Stewart, Sting
4 Smoke on the Water - Deep Purple, Queen, Black Sabbath, Iron Maiden, Pink Floyd, Yes, Rush

Vox - Ian Gillan, Bruce Dickinson, Paul Rogers, Bryan Adams.
Kerrang called this collaboration "the greatest array of hard rock talent ever assembled" (including guitarists, bassists and drummers, and not only singers).
This song is on YouTube. - Metal_Treasure

5 We Don't Need Another Hero - Northern Kings

Tina Turner metal cover.
Vox - Jarkko Ahola, Tony Kakko, Marco Hietala, Juha-Pekka JP Leppäluoto. - Metal_Treasure

6 The Scarecrow - Avantasia

Tobias Sammet and Jorn Lande. - Metal_Treasure

7 The One You Love to Hate - Rob Halford

It's a duplicate - it's already in the top 10 - Metal_Treasure

The song sample is from a live version because I didn't find the studio version on iTunes. - Metal_Treasure

8 Let the Storm Descend Upon You - Avantasia
9 Out of Control - Edguy

Tobias Sammet and Hansi Kursch.
I also think that one line in the background is sung by Timo Tolkki who was a guest guitarist (but I know he can sing). Just the voice on that line doesn't sound like Tobi or Kursch to me (it's on the song sample - "and let me stay blind"). - Metal_Treasure

10 The Seven Angels - Avantasia

The Contenders

11 When Time Doesn't Heal - Allen Lande

Jorn Lande and Russell Allen of Symphony X. - Metal_Treasure

12 Under Pressure - Queen & David Bowie
13 The Raven Child - Avantasia

3 awesome singers: Hansi Kürsch, Tobias Sammet and Jørn Lande - Metal_Treasure

14 Begging for Forgiveness - Helker

Vox - Diego Valdez, Tim ‘Ripper’ Owens, Ralf Scheepers - Metal_Treasure

15 Kiss from a Rose - Northern Kings
16 Ghostlights - Avantasia
17 Walk This Way - Aerosmith & Run-DMC
18 This Mess We're In - PJ Harvey

Featuring Thom Yorke. - Lotuscandy

19 Cars - Fear Factory
20 Fallen - 30 Seconds to Mars

This song is a true masterpiece. - 21merowitzn

21 Passenger - Deftones
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