On Wings of Song (Auf Flügeln des Gesanges) is probably one of Mendelssohn's most recognizable compositions. I have played it as a piano solo, and taught it to voice students (German version). It also comes in various chamber settings, such as violin/piano versions.
The text (written by Heinrich Heine) tells of two lovers who are transported by the power of song to a gorgeous night garden where they can dream among the beautiful flowers, gazelles, quiet stream and palm tree.
Auf Flügeln des Gesanges
Dort liegt ein rotblühender Garten
Die veilchen kichern un kosen,
Es hüpfen herbei und lauschen
Dort wollen wir niedersinken
On wings of song,
There lies a red-flowering garden,
The violets giggle and cherish,
The gentle, bright gazelles,
There we will lay down,