Penny Gore presents a week of programmes reflecting on musical firsts featuring the BBC National Orchestra of Wales. Penny introduces a recent concert recorded at Bangor University last November, as part of the 125th anniversary celebrations. It opens with the most recent premiere given by the orchestra, from Resident Composer Guto Puw, 'Break the Stone' - a reference both to a Welsh folksong and the quarrying heritage of North Wales. The final item in the week comes from one of the most memorable concerts of the orchestra's 2008-9 season at St. David's Hall in Cardiff, Mahler's mighty 7th Symphony, his Song of the Night. Guto Puw: Overture: Torri'r Garreg BBC National Orchestra of Wales Garry Walker (conductor) Haydn: Symphony No. 70 in D Major BBC National Orchestra of Wales Garry Walker (conductor) 2.40pm William Mathias: Horn Concerto (Op. 93) Tim Thorpe (horn) BBC National Orchestra of Wales Garry Walker (conductor) 3.10pm James MacMillan: The World's Ransoming Celia Craig (cor anglais) BBC National Orchestra of Wales Grant Llewellyn (conductor) 3.30pm Mahler: Symphony no. 7 BBC National Orchestra of Wales Kazushi Ono (conductor).