D vs C Tin Whistle: Which Should You Buy?

A D whistle's lowest note, all six holes covered, is the D an octave and a tone above middle C, and it plays about two octaves up from there. Its natural scale is D major. Add one half-holed or cross-fingered C natural and it also plays G major, and the same notes give you the minor and modal keys Irish music lives in: E minor, E Dorian, B minor and A Mixolydian.

A C whistle's lowest note is the C an octave above middle C, the same note as the bottom of a soprano recorder, and everything sits a whole tone lower. Its natural scale is C major. Add a half-holed B flat and it plays F major, and its modal keys are A minor, D Dorian and G Mixolydian. Put simply, a C whistle does in C and F what a D whistle does in D and G.

An Irish session runs in D and its neighbours. The uilleann pipes, the flute and most of the tunes are pitched around D, and the common keys (D, G, E minor, A Mixolydian, B minor) all sit naturally on a D whistle. Bring a C whistle to a session and you are a tone below everyone, with no fingering trick to fix it short of playing every tune in an awkward, half-holed key. If sessions or Irish dance music are anywhere in your plans, you need a D.

The C whistle earns its place elsewhere. It plays tunes written in C or F without half-holes, it suits songs pitched lower for a singer, and it sits happily with piano, keyboard and school music, where C is the default key. In traditional music its main use is playing along with flat-pitched uilleann pipes in C, and with recordings made on them. Tabs written for a D whistle still work on a C whistle note for note, because the fingering is the same, but the tune comes out a tone lower, so it won't match a backing track or a recording in D. The finger chart can be switched to a C whistle to show the notes yours actually plays.

A whole tone is a small gap, so the two whistles are much closer in voice than a D and a low D. The C is a little rounder and sweeter, and its second octave is less piercing, which some people prefer for playing at home. The D is brighter and carries further, which is exactly what you want in a session or over other instruments. Neither is better in the abstract; the D is the sound of Irish whistle music because D is the key the music is in.

Physically, a C whistle is about an eighth longer than a D, with the holes a touch further apart. For most adults the difference is barely noticeable. For small hands a D is slightly easier to cover cleanly, but the gap is nothing like the stretch of a low whistle, and young children manage C whistles in class all the time.

C whistles are common in schools, especially outside Ireland, for practical reasons. Classroom songbooks, keyboards, glockenspiels and recorders are all centred on C, and a C whistle's bottom note is the same as a soprano recorder's, so a class can play whistles and recorders together from the same music. In Irish schools, where the whistle is taught as part of the tradition, the D whistle is the norm.

If your child's class uses C, buy C. Matching the teacher and the book matters more than anything else on this page. The only catch comes later: a child who learned on a C whistle calls the all-fingers-down note C, and on a D whistle that same shape is called D. The fingers transfer perfectly; only the note names shift by a tone, and most children adjust within a lesson or two. If there is no class and no teacher choosing for you, start a child on D, the same as an adult.

For almost everyone, a D. It matches the tutorials, the tabs and the sessions, it plays the two keys most traditional tunes are in, and it costs no more than a C: makers such as Generation and Clarke sell C and D versions of the same whistle for about the same price. The whistle buying guide compares the models, and how to buy your first tin whistle covers what to look for in the shop.

Buy a C first if a class or teacher uses C, if most of the music you play is written in C or F and you don't want to transpose, or if you accompany a singer or piano in those keys. Once you have a D, a C is a cheap and useful second whistle for exactly those situations, though the low D is the more common second whistle for players who mainly want a new sound. For every other key and what it is for, see choosing the right tin whistle key; for what a whistle's key actually means, see what key is a tin whistle in.