Webpages on slow sessions (Irish), playing by ear

From a website called Treelight hosted and written by Eric Armstrong of Mountain View, Calif., whose credentials and interests include software systems, martial arts and Irish session music. His notes on music, especially on sheet music and playing by ear, look helpful, even though I didn't have time to read them thoroughly. Note to self: Come back to these links during spring break! Below are some of Armstrong's links, copied and pasted from his music page.

Music as a Second Language: Learning to Play and Playing with Others

Learning to Play By Ear
Slow Sessions (advice on sheet music, trading tunes, and accelerating the tempo)
Building a Community with Music and Dance

Irish Music: Music Anyone Can Play -- By Ear!!

How I Got Started in Irish Music
Introducing Irish Music and Dance
Top 40 Irish Tunes
Resources
Acknowledgments