Episode 45.

ABBA stopped off in Bremen on their way home from filming ABBA in Switzerland to perform their current single Chiquitita on this show. The programme was hosted by Manfred Sexauer and Uschi Nerke.  This clip was later featured in the German programme ABBA & Co.  An edited version of Chiquitita was the one originally broadcast (ie. one verse only).

The complete performance was shown on the 2000 version of The Best Of ABBA / Musikladen Extra.

Other guests on the show included:

Blondie - Heart of Glass
Gloria Gaynor - I Will Survive
Sheila B Devotion - Seven Lonely Days
Renee - Whole Lotta Shakin' Goin' On
Luv - All You Need Is
ABBA - Chiquitita
The Sweet - Call Me
Clout - Save Me
Gerard Kenny - New York, New York
Amanda Lear - Fashion Pack
Tina Turner - Viva La Money
Boney M - Holiday
Village People - In The Navy

Lyrics available on the Official ABBA site

Musikladen (Mamma Mia), 1975;
Musikladen Extra (The Best of ABBA) (Waterloo, Honey Honey, Tropical Loveland, SOS (this one from 1975), Rock Me, Dancing Queen, Rock Me, Dancing Queen, Mamma Mia, I've Been Waiting For You, Fernando and So Long), 1976; 
Musikladen (Chiquitita), 1979;
Musikladen (Agnetha and Tomas Ledin - Never Again), 1982; 
Musikladen (Agnetha - The Heat Is On), 1983; 
Musikladen (Frida - Shine), 1984;

Thanks to Aaron Evans, Jos Heselmans, Julian D, Jozsef, Philip Muytjens and Jun Seo.
YouTube link c/o Musikladen