This article presents an investigation on music education in Northern Ireland (NI) aimed at uncovering how 22 music teachers in post-primary schools addressed the 2007 statutory music curriculum in terms of its potential to promote social cohesion in NI's post-conflict society, where most schools are segregated on religious grounds. In the discussion we consider three curriculum requirements: (i) to promote cross-cultural and (ii) mutual understanding and (iii) to undertake shared learning through school collaboration. While presenting a primarily positive view to the promotion of cross-cultural understanding, the data outlines the existence of closed minds across the community divide. Approaches to mutual understanding evidenced a picture of classroom activity where it was translated into 'mutual respect'. Shared learning through school collaboration was treated on two fronts: collaboration needed to access external exams, and collaboration arising from the Department of Education's 2015 Shared Education initiative. While exam collaboration raised issues for pupils and teachers, the shared education initiative promoted a small number of cross-school projects driven by individual teachers. Educational implications are considered in the conclusions.