"Somewhere Only We Know" is a traditional piano rock song. The piano is the most relevant instrument due to its harmonic and rhythmic role. It is played in quavers throughout the whole song, holding the tempo and the rhythmic pattern. The studio version is recorded in 87bpm, and follows a 4/4 time signature, the most commonly used in traditional rock songs. It is in the key of A major. The song form can analyzed as ABAB CBCB, a variation of the strophic form. The verse (A) chord progression is a plain (I-II-V), one of the most used chord progressions in music; the chorus (B) presents a (VI-III-IV-V) progression; the variation of the verse section (C) presents a (II-III-IV-V) progression.