The black vertical lines divide the piece into bars, each bar is divided by orange lines into time intervals of one beat. So in the case of 'Inisheer' for example, which is in 3:4 time, each bar is divided into 3 (3 beats to the bar). I have then sub-divided each beat into two half beats, with the short orange lines.
The whistle diagrams have been placed where the note is played. Where there are gaps, the last note is held to fill the time span of the gap.
The solid red colour on the whistle holes indicates those holes which are to be covered by the fingers.
Notes played in the upper octave are indicated where the whistle mouth piece is blocked in with red.
Double dots at the start and finish of a bar indicate that the section between them is repeated. (Except any bars marked with a bridge numbered 1). When you repeat the piece, skip the 1st bridge, and play the 2nd bridge instead.
The arrowed line indicates go back to the start!
Breathing... try to intake breath in the 4th, 8th, 12th and 16th bars (of Inisheer),
as there is a natural break at this point.
You can listen to these tunes by opening the links to the mp3 recordings