Marcio was born in Belem, Para, in the north of Brazil, where he studied Social Sciences (Anthropology, Sociology and Political Science) at the "Federal University of Para" (UFPA). He begun his music studies at the "Carlos Gomes Conservatory", where he studied classical singing, symphonic percussion and folk guitar. His singing studies were further refined at the "Maestro Waldemar Henrique School of Music". He was a member of the "Carlos Gomes Conservatory Symphonic Chorus" and a Vocal Technique teacher at "Tao Academy of Music". He also taught private lessons at the "Musical Activities Services of the Federal University-" (SAM-UFPA), while he kept his classical singing recitals in Belem. He was a voluntary music teacher at the most respected institution for the blind people in Belem, Instituto Jose Alvares de Azevedo. Marcio has been selected to perform in international music festivals and workshops throughout Brazil, including Chorus Conducting, Renaissance Music & Dance, Classical Singing Techniques, Baroque Singing, Rhythm and Pulse, Music Therapy, Contemporary Music Composition and more. Some of his "Musical Improvisation" workshops and live performances were directed, conducted and joined by great names such as Egberto Gismonte, Carlos Malta, Hermeto Pascoal, among others. During his Music Therapy workshop in Curitiba-PR, he found out that one of the Nations best Music Therapy Colleges was located on that beautiful city.  At that same year he moved to Curitiba in the south of Brazil, after been accepted upon passing the Music Therapy entrance exam (vestibular). Living in Curitiba, Marcio was invited to compose and perform live the soundtrack of the theather Spectacle "Lucifer Depression". The production was a complete success, and they were invited to appear at the "International Theather Festival of Curitiba". During his Music Therapy course he accumulated more than 4,000 hours of experience attending people with various types of mental and/or physical needs (elderly people, Down Syndrome, Autism, Sociopath Syndrome, Alzheimer's patients and more). He was selected to participate in a government program attending in the urban slums (favelas), using the power of percussion to rescue children at risk, which have been in part already involved with drugs and gangs. The project was a great success and the kids formed their own musical groups performing all over the city. Marcio was also invited to join some bands in Curitiba, and joined three: The "Celtic Planet", "Aires Gallegos" (music from Galicia, Spain) and Keltoy (traditional music from Scotland, Ireland, Brittany - ancient France). He performed as a percussionist and vocalist in these bands until he got his Music Therapy College Degree and his Massage Therapy Professional Degree in 2000. Soon after that, he moved to Boston-Massachusetts, where he has been performing as vocalist, percussionist, guitar and bass player with several artists and groups such as: SP Jazz, Choro Trio, Eddy Dyer & Walking Shoe Revival, Espresso Brazil, Samba Tremeterra, Marcio & Friends, Unidos de Boston, Guy Mendilow, Os Bossais, The Brazilian Popular Ensemble, Sonho Meu, Elena Zoubareva Classical Ensemble and more. Some great names of Brazilian music such as Milton Nascimento, Daniela Mercury, Alcione, Zelia Duncam and Virginia Rodrigues had their concerts in Boston opened by Marcio Roberto D'aLari.

Marcio has been volunteering for the  "Tuesday Meals Program" at the First Parish Church in Cambridge. He has also been the subtitute coordinator, managing food preparation, setting- up and dinner servings for the homeless people in Harvard Square. He is an administrative member and one of the therapists of the “Star of Life Healing Center” in Somerville - MA, attending as Music Therapist and Massage Therapist.