DISCOGRAPHY:

- Sonar aka Niki B & Christian E.F.F.E. - "Afrìk"- Sun Generation records (I -UK) 2001
- Christian E.F.F.E. & Niki B - "Mekkanika" - Primate records (UK) 2002, licensing on STAR69 records (USA) 2003
- Christian E.F.F.E. & Niki B - “Shadow” – Minimalistik records (I – D) 2002
- Christian E.F.F.E. & Niki B - “Bodhisattva” – Minimalistik records (I – D) 2002
- Sonar aka Niki B & Christian E.F.F.E. - "Brazilia" - Sun Generation records (I - UK) 2002
- Niki B & Christian E.F.F.E. - "jAMAìK" - Presslab records (I - UK) 2003
- Niki B & Christian E.F.F.E. - "Heart" - Fire music (F) 2003
- Niki B & Christian E.F.F.E. - "Another day" - Presslab records - (I - UK) 2003
- Sonar aka Niki B & Christian E.F.F.E. - " Stop Complaining" - Sun Generation (I - UK) 2004
- Niki B & Christian E.F.F.E. & Simone Mencarelli - "Zac" - Fire music (F) 2004
- Niki B & Christian E.F.F.E. - "Eyes" - Swift records (Greece) 2004
- Niki B & Christian E.F.F.E. - “Behind the Fame” – Saw recordings (USA) 2004
- Niki B & Christian E.F.F.E. - "Lost" - Swift records (Greece) 2004
- Niki B & Christian E.F.F.E. feat. Elis – “Burning My Soul” - Substance records (Malaysia – Canada) 2004
Remixes:

- Tantamanna - "Soul food" - NIki B & Christian E.F.F.E. RMX- Presslab records (UK - I) 2002
- I'Jack - "Falling" - NIki B & Christian E.F.F.E. RMX - Renaissance records 2003 (UK)
- Tantamanna - "Do you love me too" - NIki B & Christian E.F.F.E. RMX-
Presslab records (UK - I) 2004
- Elisa - "Heaven out of Hell " - NIki B & Christian E.F.F.E. RMX 2003
- Simple Minds- "Woman" - NIki B & Christian E.F.F.E. RMX - Fire music (F) 2004
- Kissing the Pink - "One Step"- NIki B & Christian E.F.F.E. RMX –
Absolutely records (UK - I) 2004
- Simple Minds – “Alive & Kicking” - NIki B & Christian E.F.F.E. RMX –
Absolutely records (UK - I) 2004