2008 - OMM's first gathering at the Arts House
2009 - OMM at HSBC Youth Excellence Awards
2010 - OMM performed Mahler's Symphony No. 2 which received critical acclaim
2012 - OMM debuts at the Singapore Arts Festival, performing Stravinsky's "Rite of Spring"
2012 - OMM tours the United Kingdom, participating in the Cheltenham Music Festival
2013 - OMM hosts its first OMM Orchestra Camp
2013 - OMM debuts in ChildAid
2015 - OMM performs Mahler Symphony No. 8, as a gift in celebration of Singapore's 50th birthday