The second period peaks with his development into a metamorphic technique, one where a musical motif undergoes repeated transformations.
The piano works Draumkvæ Sonata and Fantasi i Halling, generally viewed as standards in Norwegian repertoire, are both pieces that represent Egge's first compositional period.
Following the Second World War, the folk music elements of Egge's compositions gradually became less pronounced, and were succeeded by a more universal tonal language.
Egge retains his distinct, clear diatonic passages, frequently contrasted by sharp dissonances.
One of the distinct traits of this compositional period is Egge's development of a metamorphosis technique, in which motifs are subjected to repeated transformations.
This technique reaches its pinnacle with Egge's 1966 Cello Concerto, the first movement entitled Preludio metamorfico.
Egge also focused on vocal compositions and has penned songs and choir works, a capella, with piano, and with orchestral accompaniment.