| O Christmas Tree | BWW |
| O Come All Ye Faithful | BWW |
| O Come All Ye Faithful 2nds | BWW |
| O Come All Ye Faithful v2 | BWW |
| O Come All Ye Faithful v3 | BWW |
| O Come All Ye Faithful v4 | BWW |
| O Come O Come Emmanuel | BWW |
| O Danny Boy | BWW |
| O For a Closer Walk with God | BWW |
| O For A Thousand Tongues | BWW |
| O Gin I Were A Baron's Heir | BWW |
| O Holy Night | BWW |
| O Little Town of Bethlehem | BWW |
| O Little Town of Bethlehem v2 | BWW |
| O Little Town of Bethlehem v3 | BWW |
| O Luaidh aka Gaelic Air | BWW |
| O Luaidh aka Oh My Dearest Dear | BWW |
| O Luaidh aka Oh My Dearest Dear with Seconds v2 | BWW |
| O the Britches Full of Stitches | BWW |
| O.P. Tibbett's | BWW |
| O' Canada | BWW |
| O'Donnell's March | BWW |
| O'er Muir Amang the Heather | BWW |
| O'er the Bows of Ballindalloch | PIO |
| O'er the Bows to Ballindalloch | BWW |
| O'er The Hills and Far Away | BWW |
| O'er The Hills and Far Away v2 | BWW |
| O'er the Hills and Far Away v3 | BWW |
| O'er The Hills and Far Away v4 | BWW |
| O'er the Water to Charlie | BWW |
| O'Farrells Welcome to Limerick | BWW |
| O'Keefe's Slide | BWW |
| O'Neill's March | BWW |
| O'phidian's Flight | BWW |
| O'Rourkes | BWW |
| O'Sullivan's March | BWW |
| Oaken Bench, The | BWW |
| Octagon, The | BWW |
| Ode to Joy | BWW |
| Off to (The Humours of) California | BWW |
| Officious Official, The | BWW |
| Oft In The Stilly Night | BWW |
| Oft in the Stilly Night-Jig | PIO |
| Oft in the Stilly Night-March | BWW |
| Oft in the Stilly Night-March v2 | BWW |
| Oft in the Stilly Night-Slow Air | PIO |
| Oh Christmas Tree 2 | BWW |
| Oh Susannah | BWW |
| Oh The Britches Full of Stitches | BWW |
| Oh, The Britches Full Of Stitches | PIO |
| Oh! But You Will Come To Town | BWW |
| Old Adam | BWW |
| Old Adam (Auld Adam) v3 | BWW |
| Old Adam v2 | BWW |
| Old Boy, The | BWW |
| Old Hag at the Churn | BWW |
| Old Hag at the Churn aka O'Dubhshlaine's Jig | BWW |
| Old Hag at the Spinning Wheel, The | BWW |
| Old Hag at the Spinning Wheel, The v2 | BWW |
| Old Knife Grinders Spring Song-DK, The | BWW |
| Old Missouri | BWW |
| Old Rugged Cross, The | BWW |
| Old Rustic Bridge by the Mill, The | BWW |
| Old Rustic Bridge, The | BWW |
| Old Rustic Bridge, The v2 | BWW |
| Old Toasty | BWW |
| Old Toasty v2 | BWW |
| Old Wife of the Mill Dust, The | BWW |
| Old Wife Of The Mill Dust, The | BWW |
| Old Woman's Dance | BWW |
| Old Woman's Dance v2 | BWW |
| Olympic Fanfare | BWW |
| On a Roll | BWW |
| On Evil | BWW |
| On Evil v2 | BWW |
| On The Road to Passchendaele | BWW |
| On The Road To Passchendaele v2 | BWW |
| Onaping Falls | BWW |
| Onaping Falls v2 | BWW |
| Once In Royal David's City | BWW |
| Once Upon a Dream | BWW |
| One and Only Peej, The | BWW |
| One Before We Go | BWW |
| Only Our Rivers Run Free | BWW |
| Onward Christian Soldiers | BWW |
| Orange and Blue | BWW |
| Orange and Blue | PIO |
| Orange and Blue v2 | BWW |
| Orange and Blue v3 | BWW |
| Orange Walk | BWW |
| Orange Walk | PIO |
| Ord of Caithness, The | BWW |
| Ord of Caithness, The v2 | BWW |
| Orkney Wedding | BWW |
| Orlando Tango, The | BWW |
| Oromocto Legion Pipes and Drums | BWW |
| Our Ain Fireside | BWW |
| Our God Our Help In Ages Past | BWW |
| Out Flanked | BWW |
| Out in the Ocean | BWW |
| Out of Boredom | BWW |
| Out Of The Air | BWW |
| Out of the Air v2 | BWW |
| Out of the Blue | BWW |
| Outward Bound | BWW |
| Over The Isles To America | BWW |
| Over the Isles to America v2 | BWW |
| Over There | BWW |
| Overlander, The | BWW |
| Owl's Hoot | PIO |