SONGS:
Singing in Irish Gaelic, Mary McLaughlin -- songs, lyrics, phonetics, comes with CD with spoken tracks and sung tracks
Ceolta Gael, Seán agus Mánus Ó Baoill -- songs and lyrics only
Ceolta Gael 2, Mánus Ó Baoill -- songs & lyrics only
LANGUAGE:
Progress in Irish, Máiréad Ní Ghráda -- leading textbook among online and in person learning groups. The lessons are practice driven. There are no grammatical explanations or answer keys, but many sources exist online.
Buntús Cainte, Tomás Ó Domhnalláin -- 3 volumes. Comes with CDs for pronunciation. A little bit English biased, but short conversational lessons make the lessons move easily.