Lycka
Sven-Olof Walldoff was responsible for the orchestral arrangements , and on the 2006 re-release a few bonus tracks were added , notably early recordings with the two-girl half of the future group ABBA on backing vocals , Anni-Frid Lyngstad who was engaged to Benny Andersson and Agnetha Fältskog who was married to Björn Ulvaeus . 
<triplet> ABBA <subj> Anni-Frid Lyngstad <obj> has part <subj> Benny Andersson <obj> has part <subj> Agnetha Fältskog <obj> has part <subj> Björn Ulvaeus <obj> has part <triplet> Anni-Frid Lyngstad <subj> ABBA <obj> member of <subj> Benny Andersson <obj> spouse <triplet> Benny Andersson <subj> ABBA <obj> member of <subj> Anni-Frid Lyngstad <obj> spouse <triplet> Agnetha Fältskog <subj> ABBA <obj> member of <subj> Björn Ulvaeus <obj> spouse <triplet> Björn Ulvaeus <subj> ABBA <obj> member of <subj> Benny Andersson <obj> partner in business or sport <subj> Agnetha Fältskog <obj> spouse