As a musician, he played in the nationally successful band Electric Banana Band. Åberg is also the creator of Trazan & Banarne, one of the most beloved Swedish kids shows ever. It was shown on Sveriges Television in the late 1970s/early 1980s. The characters of the show, Trazan Apansson (Åberg) and Banarne (Klasse Möllberg) are also members of the Electric Banana Band.
As an Artist, he is famous for making various lithographs; one of his stocks in trade are sketchy Mickey Mouse drawings. He is a member of Svenska Serieakademien. He also re-designed the seat textiles for the Stockholm Metro subway in the 1990s.
At the 17th Guldbagge Awards he won the Ingmar Bergman Award. At the 27th Guldbagge Awards he won the award for Best Actor for his role in Den ofrivillige golfaren.
