this is my favorite song off this album, its very pretty!
i asked ace at a show how to play this, he said he didnt remeber off hand, 
but it is tuned half a step down......heres the main riff

Eb--------|\
Bb-------1| \
Gb-------0|  \4
Db----2---|  /times
Ab--3---3-| /
Eb--------|/

Eb--------|\
Bb-------1| \
Gb-------0|  \4
Db----2---|  /times
Ab--0---0-| /
Eb--------|/

Eb--------|\
Bb-------1| \
Gb-------0|  \4
Db----2---|  /times
Ab--------| /
Eb--3---3-|/

Eb--------|\
Bb-------1| \
Gb-------0|  \4
Db----2---|  /times
Ab--3---3-| /
Eb--------|/

thats the begging riff and it is also played through other parts of the song