His father, Marcell Tyberg (Sr.), was a well-known violinist, while his mother, Wanda Paltinger Tybergova, was a pianist in the school of Theodor Leschetizky, and a colleague of Artur Schnabel.
Marcel dedicated lieder to Jan's two daughters and, despite a twenty-year age gap, cultivated a lifelong friendship with their young brother, the conductor Rafael Kubelik.
He taught harmony, played church organs, conducted, and under the pseudonym "Till Bergmar" produced popular dance music for the local resorts (rumbas, tangos and waltzes, etc.).
A pious Roman Catholic, Tyberg composed a setting of the Te Deum, which was premiered in the expanded church of Abbazia on 25 July 1943, the day Mussolini was forced out of office.
[1] When German forces occupied northern Italy in 1943, Tyberg's mother, in compliance with Nazi regulations, registered that one of her great-grandfathers had been Jewish.
[1][3] Tyberg's surviving music, in the form of manuscript scores, was entrusted by him to his friend, Dr. Milan Mihich, and ultimately brought to the United States.
3 (JoAnn Falletta conducting the Buffalo Philharmonic), coupled with the Piano Trio (Michael Ludwig, violinist; Roman Mekinulov, cellist; Ya-Fei Chuang, pianist), on Naxos Records; the two Masses (Brian A. Schmidt conducting the South Dakota Chorale, with Christopher Jacobsen, organist), on Pentatone; the String Sextet with Double Bass (Ensemble Alraune) on NovAntiqua Records (Musica & Regime 3).