He knew about his disease throughout his career and the awareness of his forthcoming death can be heard from both his lyrics and music.
He wrote the songs and lyrics (in Finnish), and performed vocals and acoustic guitars on the albums.
On the first one, Magneettimiehen kuolema (1970), he collaborated with Tasavallan Presidentti, a renowned Finnish prog band of the time.
On Kesämaa (1972), various other noted musicians such as Olli Ahvenlahti and Hasse Walli took part in the studio sessions.
Pekka Streng avoided publicity and gave only one interview to a music journalist during his life.