There are a number of excellent sites where you can listen to or download Irish music, for free and legally.

RTE Radio 

RTE is the Irish national broadcaster. It has two long-running weekly programmes, The Late Session et Ceili House, as well as documentaries and live recordings.

http://www.rte.ie/radio1/ceilihouse/

http://www.rte.ie/radio1/thelatesession/ 

http://www.rte.ie/radio1/anfearceoil/ 

http://www.rte.ie/radio1/inconcert/

http://www.rte.ie/lyricfm/trad/

http://www.rte.ie/lyricfm/reels/

http://www.rte.ie/rnag/lanamhala.html

Clare FM

Clare Fm has several downloadable programmes per week.

Derniers téléchargements de Clare FM

The Kitchen Sessions

An excellent series broadcast by Clare FM

http://ragandbone.ie/ 

Comhaltas

A regularly updated series of live recordings.

Comhaltas Live 

Irish Flute Tunes

Hundreds of tunes recorded by flutist Michael Clarkson.

http://irishflute.podbean.com/