The Spring Sound Project is a music project mixing jazz and traditional Bulgarian folk songs. The idea was born in the midst of the first lockdown in the spring of 2020 : at first this long « pause » was unwanted but it became in fact a time of creation. The project gathers personal pieces and Bulgarian music arrangements. This heritage of traditional music comes from a book that was passed down by Guillaume’s grand-father. The Spring Sound Project’s music falls within jazz improvisation, with well-defined moments fixed by the music sheet and where the musicians have the space to interact with each other.