Tin Whistle Sheet Music Notes
When I was working out the notes for these songs I was using a whistle in the key of D. Most of the sheet music is either in the key of D or G. Most of the songs have a youtube video showing how to play them and I have also used basic easy to follow letter notes. I find the system of using letters easier to follow a quicker to play along to.
If your new to playing the whistle I's suggest you start off in the Children's section as these songs are easier to learn. Don't be embarrassed about playing children's songs as we all have to start somewhere and if you try some of the other songs you may get disillusioned and give up.