Le Onde is a slow and flowing piece. Einaudi claimed that he wrote the piece "Le Onde" when he was thinking of The Waves.
The piece is split into parts, with each part being repeated until the coda at the end which brings it to a close. It builds up texture incorporating a melody in the right hand and long fast arpeggios in the left. There is a distinctive chord pattern which repeats throughout the arpeggios. In the chorus there is a key change and the arpeggios change to incorporate new melodies and motifs.