The Piano Sonata No. 16 in C major, K. 545, by Wolfgang Amadeus Mozart was described by Mozart himself in his own thematic catalogue as "for beginners," and it is sometimes known by the nickname Sonata facile or Sonata semplice.
The first movement is written in sonata form and is in the key of C major. The familiar opening theme is accompanied by an Alberti bass, played in the left hand.
[From wikipedia : http://en.wikipedia.org/wiki/Piano_Sonata_No._16_(Mozart)]
This a transcription from http://dme.mozarteum.at/DME/nma/nma_cont.php?vsep=197&p1=122