| Nombre | Año |
|---|
| Leben ... I Feel You ft. Peter Heppner | 2002 |
| Let You Go ft. Schiller | 2001 |
| Let Me Love You ft. Kim Sanders | 2007 |
| Dream Of You ft. Peter Heppner | 2000 |
| I´ve Seen It All ft. Maya Saban | 2002 |
| Life... I Feel You | 2006 |
| Freiheit | 2019 |
| Miles And Miles ft. Maire Brennan | 2004 |
| Sonne ft. Unheilig | 2013 |
| Ruhe | 2019 |
| Einsamkeit | 2000 |
| Ohne dich ft. Schiller | 2020 |
| Tired ft. Jaël Malli | 2007 |
| Dancing With Loneliness ft. Kim Sanders | 2000 |
| I Miss You ft. Maya Saban | 2002 |
| The Smile ft. Sarah Brightman | 2002 |
| Falling ft. Maire Brennan | 2004 |
| Try ft. Nadia Ali | 2009 |
| Fate ft. Isis Gee | 2007 |
| I Will Follow You ft. Henree | 2009 |
| Breathe ft. September | 2007 |
| Desire ft. Veljanov | 2002 |
| Der Tag ... Du Bist Erwacht ft. Jette von Roth | 2004 |
| Glück Und Erfüllung | 2019 |
| Distance ft. Kim Sanders | 2000 |
| Forever ft. Kim Sanders | 2007 |
| Always You | 2009 |
| Liebe ft. Milu | 2002 |
| I Know ft. Kim Sanders | 2004 |
| Let It Rise ft. Midge Ure | 2009 |
| Sunrise ft. Lenka | 2009 |
| Un Solo Minuto ft. Odette Di Maio | 2009 |
| Black ft. Jette von Roth | 2007 |
| Sleepy Storm ft. Jette von Roth | 2004 |
| Tiefblau | 2009 |
| Die Nacht ... Du Bist Nicht Allein ft. Thomas Detert | 2004 |
| Babel ft. Milu | 2002 |
| Delicately Yours ft. Kim Sanders | 2002 |
| In The Dark ft. Jette von Roth | 2007 |
| Everything | 2007 |
| Addicted ft. Lenka | 2009 |
| What's Coming ft. Jette von Roth | 2004 |
| Der Prophet ft. Otto Sander | 2000 |
| Under My Skin ft. Kim Sanders | 2009 |
| Porque Te Vas ft. Ana Torroja | 2007 |
| Don't Go ft. Kate Havnevik | 2009 |
| I Saved You ft. Kim Sanders | 2004 |
| Das Ende | 2000 |
| Atemlos | 2009 |
| Sehnsucht: Reprise | 2013 |
| Blind | 2009 |
| Nacht ft. Ben Becker | 2007 |
| Liebesschmerz | 2019 |
| Paradise ft. Arlissa | 2016 |
| Lonely ft. Damae | 2007 |
| In der Weite ft. Anna Maria Mühe | 2007 |
| Sonnenuntergang ft. Trance Allstars | 2000 |
| Der Kuss ft. Anna Maria Mühe | 2007 |
| Unruhig Herz ft. Anna Maria Mühe | 2009 |
| Not In Love ft. Arlissa | 2016 |
| Vor Der Zeit ft. Ben Becker | 2007 |
| Augenblick ft. Anna Maria Mühe | 2009 |
| The Fire ft. Kate Havnevik | 2009 |
| Die Wirklichkeit ft. Trance Allstars | 2000 |
| Until The End Of The World ft. Schiller | 2019 |
| Der Anfang II ft. Trance Allstars | 2000 |
| Unendlich ft. Trance Allstars | 2000 |
