Quartet in F Major Op.18 No.1 I Quartet in F Major Op.18 No.1 III Quartet in G Major Op.18 No.2 II Quartet in G Major Op.18 No.2 IV Quartet in D Major Op.18 No.3 I Quartet in D Major Op.18 No.3 IV Quartet in C Minor Op.18 No.4 I Quartet in C Minor Op.18 No.4 III Quartet in A Major Op.18 No.5 II Quartet in A Major Op.18 No.5 IV Quartet in B-flat Major Op.18 No.6 I Quartet in B-flat Major Op.18 No.6 IV