Sinéad O'Connor does a wonderfull cover of chiquitita (ABBA 1979) on the album 'Across the bridge of hope' (23feb1999) a charity album for the Omagh fund.
On the same album, there is a nice version of silent night by Enya.
www.sinead-oconnor.com
www.artistdirect.com/nad/store/artist/album/0,,867374,00.html