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Oíche Chiúin 1988 3:44
Oíche Chiún 1988 3:44
On My Way Home 1995 5:08
On My Way Home (Remix) 1997 3:35
On Your Shore 1988 3:59
Once You Had Gold 1995 3:16
One By One 2000 3:53
Only If... 1997 3:17
Only If You Want To (Promo) 1997 3:22
Only Time 2000 3:37
Only Time (Remix) 2000 3:14
Oriel Window 1991 2:22
Orinoco Flow 1988 4:25
Orinoco Flow (Edit) 1988 3:43
Out Of The Blue 1987 3:12

Oíche Chiún

Also released as Oíche Chiúin. The title is spelled "Oíche Chiún" on most issues but has also appeared as "Oíche Chiúin", which appears to be the correct translation of "Silent Night". 

Oíche Chiún is an Irish language version of the traditional Christmas carol Silent Night. In addition to the listings below the track also appears on some Japanese issues of Paint The Sky With Stars.
 
Singles 1988 Evening Falls...
1989 6 Tracks
1989 Oíche Chiún (Silent Night)
1991 How Can I Keep From Singing?
1992 The Celts
1994 The Christmas EP
1997 Only If...
2001 Only Time (Remix)
 
Collections 2002 Only Time - The Collection

On My Way Home

The track has been released in its full album form running 5:08 and an edited version running 3:35. Check the individual listings below for the version used.
 
Albums 1995 The Memory Of Trees
1997 Paint The Sky With Stars
 
Singles 1996 On My Way Home
 
Videos 2001 The Video Collection
 
Collections 1997 A Box Of Dreams

On Your Shore

Albums 1988 Watermark
 
Singles 1991 Exile
1992 Book Of Days
 
Collections 1997 A Box Of Dreams
2002 Only Time - The Collection

Once You Had Gold

Albums 1995 The Memory Of Trees

One By One

Albums 2000 A Day Without Rain
 
Collections 2002 Only Time - The Collection

Only If...

A Japanese promotional issue contains what appears to be an early version of this track under the title Only If You Want To.
 
Albums 1997 Paint The Sky With Stars
 
Singles 1997 Only If...
 
Videos 2001 The Video Collection
 
Collections 1997 A Box Of Dreams

Only Time

Albums 2000 A Day Without Rain
 
Singles 2000 Only Time
 
Videos 2001 The Video Collection

Only Time (Remix)

Singles 2001 Only Time (Remix)

Oriel Window

In addition to the listings below the track also appears on some Japanese issues of The Memory Of Trees.
 
Singles 1989 Oíche Chiún (Silent Night)
1991 Caribbean Blue
1992 Book Of Days
1995 Anywhere Is
 
Collections 1997 A Box Of Dreams

Orinoco Flow

The track has been released in its full album form running 4:25 and an edited version running 3:43. Check the individual listings below for the version used.
 
Albums 1988 Watermark
1997 Paint The Sky With Stars
 
Singles 1988 Orinoco Flow (1988)
1989 6 Tracks
1989 Oíche Chiún (Silent Night)
1990 3 Tracks EP
1991 Caribbean Blue
1995 Anywhere Is
1998 Orinoco Flow (1998)
 
Videos 1991 Moonshadows
2001 The Video Collection
 
Collections 1997 A Box Of Dreams
2002 Only Time - The Collection

Out Of The Blue

Also released as Portrait (Out Of The Blue).
 
Albums 1992 The Celts
 
Singles 1988 Orinoco Flow (1988)
1989 6 Tracks
 
Collections 1997 A Box Of Dreams