Tero Toivonen has been playing with the Tapiola Sinfonietta for 20 years. He completed a Master of Music degree in 2003 and continued to study at the doctoral research unit of the Sibelius Academy; the topic of his artistically oriented doctorate is the orchestra musician and audience outreach.
In 1997, he received the black T-shirt of the Avanti! Chamber Orchestra on a long-term loan, and he wears it approximately once a month.
Apart from his orchestral work, he plays with The Golden Horns quartet. He is known as Mr Horn Teacher at the Metropolia University of Applied Sciences in Helsinki and at the Hyvinkää and Espoo Music Institutes.