The 24 Preludes that comprise Opus 11, composed over the course of eight years between 1888-96, are perhaps the most commonly performed of Scriabin's piano works. Romantic, lyrical, and full of scintillating harmonies, they are both a challenge to play and a delight to hear. Despite the key of E-major in #9, the lower voices often contain C-sharp minor passages, while the upper voices remain relatively consistently within the bounds of E major, giving the piece a unique tone color.The two preludes of Opus 27 were published in 1901 near the end of Scriabin's early compositional style. They hallmark Scriabin's predilection toward dominants and added chord tones (particularly 13ths), immediately evident in the opening measure of #2 with the upper melody beginning on a B-natural over a tonic C-major chord.Opus 13 was published in 1895 and consists of 6 piano preludes. #3 features two contrapuntal lines: the upper being smooth and linear, whereas the lower line (featured in the solo cello) is graceful and strident, sweeping across two octaves.