Being an admirer of Elvis Presley, Megas welcomed the arrival of rock & roll to Iceland by 1956, although his interest in music had to be postponed while he attended grammar school in 1960. While he was young, he studied piano and showed skill at painting. He wrote outrageous short stories for the school papers and in 1968 he also published the sheet music and lyrics to 14 songs, many of which would be released on his first records. As a young bohemian writer, he was inspired by Bob Dylan and Ray Davies, and embarked into songwriting, but his works were not copies of the American or British idols, but in fact, his songs were very original.
Megas has remained one of the most important Icelandic artists. Considered the father of Icelandic rock and acclaimed for his prolific and, sometimes controversial works, his complete discography up to 1990 was reissued in 2002, remastered and with bonus tracks.
More recently, he joined Senuþjófarnir and released two albums in 2007 with them which both were on the top 10 lists of the year.