The following homilies and speech by Pope John Paul II are available here as audio download
files: 

Homily by the Holy Father at Mass in the Phoenix Park on September 29th, 1979click here
Homily by the Holy Father at the Mass in Drogheda on September 29th, 1979 click here
Homily of Holy Father at Mass for Youth in Galway on September 30th, 1979 click here
Homily of Holy Father in Knock on September 30th, 1979 click here


NOTE:In order to listen to these audio files using your computer, your computer must have 
certain minimum specifications such as Windows Media Player or RealOne Player. 
The free version of the RealOne Player can be downloaded from www.real.com.