Question: What nationality is the composer of song Världens Lyckligaste Par?
Sentence (from "Världens lyckligaste par"): A Lasse Stefanz recording, with Olle Jönsson and Lotta Engberg, charted at Svensktoppen for 17 weeks during the period of 17 May-22 November 1987 at Svensktoppen for 17 weeks (including summer break), topping the chart.
Relevant evidence: No