Kärleksvisan (For A Friend) is the second most appreciated love song according to listeners of one of the largest radio stations in Sweden Mix Megapol.

[3] The song was performed by Sarah Dawn Finer at the evening festivities at the Stockholm Concert hall as a gift from the Swedish parliament and the Swedish people the evening before the royal wedding between Crown Princess Victoria and Prince Daniel of Sweden in 2010.

[4] The song Viskar en bön is played a lot around Christmas time.

Hallström also wrote the song I Remember Love, performed by Sarah Dawn Finer.

As a background vocalist Peter has participated at ten Melodifestivalen TV-shows and three Eurovision Song Contests.