Perhaps one of the most beautiful and relaxing Cure songs that exists could be If Only Tonight We Could Sleep. This song has never failed to put me into a relaxed, thoughtful, peaceful state of mind -- and has always made me curious about what Robert Smith was actually thinking about when he originally wrote the lyrics to the song. Everything about this song is literally flawless, even when its performed live -- and not all artists are able to keep such a level of beauty in their music when transcending from albums to live performances -- but of course, the Cure has always mastered it well.
The lyrics of the song itself are simply poetic and nearly indescribable in the type of emotions that they are able to provoke when you first hear them. Something about this particular song is so ethereal and mystical when you hear it -- you could simply close your eyes and imagine yourself in some other world or time. I once met someone who claimed that it was an ideal song to meditate to just in consideration of the overall arrangement of the music. I haven't yet tried that, but I'll agree that this is the ideal song to listen to when you truly want to calm yourself down and take your mind to another place.
Additionally, the song was eventually performed as a duet with Brian Molko from Placebo, and even this rendition of If Only Tonight We Could Sleep remained remarkably beautiful. Usually I don't like when other artists team up with a band to create a different version of a favorite song, but this is one case where I'll make an exception.