This is one of many Songs without Words (or "Lieder ohne Worte") composed by Mendelssohn. The "Songs without Words" were a popular form of expression for the composer, and he published a total of 48 of these piano pieces in 8 sets of 6 spread across his tragically short life as a composer. The song titles were added later by publishers rather than by the composer himself, and this one Op.53 No.5 has been called "Folk-Song".
The audio controls below allow you to play the mp3 version of Mendelssohn's Song without words Op.53 No.5 Folk-Song for piano or you can download the MP3 file. You can also download the midi version of Mendelssohn's Song without words Op.53 No.5 Folk-Song for piano.
The image below is the first page of the sheet music, and here you can download the full sheet music for Mendelssohn's Song without words Op.53 No.5 Folk-Song for piano in PDF format.