The Sinfonia Smith Square Fellowship orchestra is formed of 34 graduate musicians who undertake a year-long programme of professional development.

The Fellowship programme comprises performances across Britain and Europe, and features orchestral repertoire, chamber music, opera, dance and theatre, alongside artist development sessions.

[1] An integral part of the programme is the orchestra's creative partnerships with performing arts organisations including the Royal Opera House, Britten Sinfonia, Academy of St Martin in the Fields, Berkeley Ensemble, and artists such as Vladimir Ashkenazy.

[2] The orchestra frequently collaborates with artists and groups across the music industry, including nonclassical and Squarepusher, as well as in theatrical projects with the National Theatre.

The aim of Southbank Sinfonia was to provide an ensemble that would bridge the one-year period after graduation, giving them a springboard into the music profession.