Some of the songs;

Ajetaan tandemilla by Friman

Urheiluhullu by Eppu Normaali

Viidestoista yö by Juice Leskinen

Vanhojapoikia viiksekkäitä by Juha Vainio

Rentun ruusu by Irwin

Reppu ja reissumies by Tapio Rautavaara

(OK, to be more specific; the "by someone" I refer to the singer / band whose version is most well known. Many of the songs are actually composed and written by the band / artist, but for some songs the artist just performs a song written by other people)