He collaborated and received advice from Dmitri Bashkirov, Alfred Brendel, Nelson Delle-Vigne Fabbri, Jura Margulis and Gerhard Schulz (Alban Berg Quartett).

He works on a regular basis with the Danish String Quartet, Camille Thomas,[12] with whom he recorded the album Réminiscences (La Dolce Volta), Paul Lewis, Maria João Pires and Lorenzo Gatto, with whom he also performed and recorded the complete Beethoven violin and piano sonatas over several seasons (at venues including Wigmore Hall, Louvre, and the Concertgebouw Amsterdam).

He hosted "Salon Libeer", a concert series at the Bruges Concertgebouw,[17][18] in which he joins with fellow musicians and speakers to discuss the musical experiences of the audience (2017–2021).

[22] Artistic director of the Singing Molenbeek project,[23] Libeer supervises high level choir rehearsals in the primary schools of the Brussels municipality.

Alongside albums with cellist Camille Thomas (Réminiscences,[25] La Dolce Volta) and violinist Lorenzo Gatto[26] (complete Beethoven violin and piano sonatas, Alpha Classics), Libeer recorded Bach – Bartók in 2020[27] and J.S.

He takes a conceptual approach to Bach's legendary Well-Tempered Clavier mirrored with the work of classical and contemporary composers in major mode.