Education
Jeths started his musical career as a child with piano and music theory lessons in the Music School of Amersfoort with Paul Seeling. He originally studied in the Sweelinck Conservatory in Amsterdam, from 1980 to 1982. He continued with composition in the Conservatory of Utrecht with Hans Cox and Tristan Keuris.
He finished his studies with Keuris in 1988.
Parallel to composition Jeths studied musicology at the University of Amsterdam. He completed his studies with a doctoral dissertation about Elisabeth Kuyper (1877–1953), which was later published in the book Zes vrouwelijke componisten.