Jaroslav Šimíček (*1962) is a Czech jazz double bass player, composer and arranger. He graduated from the Faculty of Education in Ostrava, majoring in music education and the Czech language. In Ostrava, he also graduated from the People’s Conservatory, majoring in guitar, and was a student of jazz musician and teacher Karel Velebný. Currently he composes for Czech Television, theater and film.

Dana Šimíčková (* 1963) is a singer, songwriter and music teacher. She graduated from the Faculty of Education in Ostrava, majoring in music education and the Czech language. She currently performs solo with the swing band Shadde Yadda, in a duo with the group Two Voices and in a trio with the band Prime Time Voice, with which she also collaborates as a lyricist. He teaches singing at an music & art school, and also works with children as a music teacher in preschool facilities or as a music director in dubbing.