1955-1966 studied choir conducting at the M. K. Čiurlionis Secondary School of Art (teacher A. Jozėnas). 1966-1971 studied choral conducting at the Lithuanian State Conservatoire (classes of senior lecturer N. Kazakauskienė and lecturer L. Abarius). At the same time, he attended the solo singing class of assistant professor Z. Paulauskas. During his studies he directed amateur choirs in Vilnius and taught at the Vilnius State Pedagogical Institute.

1970-1972 Chief Chorus Master of Kaunas State Music Theatre. 1973-1975 Director of the choir of the folk ensemble "Jovaras" of the Šiauliai City Culture House of Songs and Dances. With the ensemble participated in the 1975 Republican Song Festival, performed in Moscow and Czechoslovakia. 1974-1980 lecturer and senior lecturer at Šiauliai Pedagogical Institute, director of the student mixed choir. 1978-1980 Choirmaster of the Vilnius Male Choir "Varpas" - 1979 gave concerts in Cuba. 1980-1986 Teacher of choir conducting and solo singing at Šiauliai Higher School of Music, chairman of the methodological commission for solo singing. 1984-1990 Artistic director and conductor of the male choir "Tauras" of the Šiauliai TV factory. The choir gave concerts in Yugoslavia in 1988, took part in the Republican Song Festival in 1985 and the Lithuanian National Song Festival in 1990.

Since autumn 1990 he has been a senior assistant at the Music Department of the Šiauliai Pedagogical Institute (University), since 1992 an associate professor, and from 1992 to 1994 the head of the Music Department.

S. Vaičiulionis organised the early music vocal ensemble "Polifonija" in Šiauliai in 1974. Initially, the ensemble was under the auspices of the Pedagogical Institute, and later the Higher School of Music. Within ten years, the ensemble learnt about 200 works by 16th-17th century composers, made recordings for Lithuanian radio and television, and released a long-playing record. In 1986 Polifonija was granted professional status and became the Šiauliai State Chamber Mixed Choir of the Lithuanian State Philharmonic, with S. Vaičiulionis as its artistic director and chief conductor and his wife D. Vaičiulionienė as conductor. The core of the new ensemble consists of former Polifonija choristers with musical backgrounds. Over the past 20 years, Polifonija has learnt more than 500 large-scale cantata-oratorio works by composers from the ancient world, as well as classics from Western Europe and Lithuanian composers, and has given about 2000 concerts. It has visited many Lithuanian cities and towns, sung in Latvia, Estonia, Belarus, Ukraine, Russia, Germany, Sweden, Poland, Bulgaria, Brazil, Argentina and Italy. The choirs of the above-mentioned countries have won prizes and other prizes at festivals and competitions. The choir has performed with symphony and chamber orchestras and soloists, and has made recordings for Lithuanian Radio and Television, as well as for radio and television in Latvia, Italy and Brazil. "Polifonija has recorded three records, released a CD in 1995, prepares 4-5 new programmes each year and gives up to 60 concerts. The choir's cyclical concerts have attracted the attention of audiences: "Lithuanian Music of the 16th and 17th Centuries", "Italian Music of the 16th and 17th Centuries", "Religious Music of the 16th and 17th Centuries", "Ancient and Contemporary Music of Lithuania", "Church Music of Lithuania", "Let's Enliven Lithuania", and others. "Polifonija was the first to popularize the masses and hymns of the priest G. Šukias, and to resurrect from oblivion the music of many old Lithuanian composers.

Since 1978, Polifonija started to organize festivals of old music in Šiauliai, which since 1989 have become the international festivals of ecclesiastical music. "The voices of Polifonija were heard at the 1st and 2nd World Lithuanian Song Festivals in Kaunas and Vilnius in 1994, and at the Baltic and Nordic Choir Festival in Riga (Latvia) in 1995.

S. Vaičiulionis - conductor of the Šiauliai City Song Festivals, member of the artistic council of the city's cultural department, president of the international church music festival committee and artistic director of the festivals, member of the Šiauliai Region Council of the Lithuanian Cultural Foundation, consultant to the republican song festivals, conductor of the 1994 World Lithuanian Song Festival I in Kaunas, the 1995 Baltic-Nordic Choir Festival in Riga and the 1998 World Lithuanian Song Festival II in Vilnius. In 1980, he was awarded the Mark of the Culture Marker, and in 1995 he was awarded the honorary title of Honored Artist.