7. Nocturne No.20 in C Sharp Minor, Op.Posth Nocturne No.20 in C sharp minor, Op.post. Nocturne No.20 in C sharp minor Op.posth Nocturne No. 20 in C sharp minor, op. post. Nocturne No.20 in C sharp minor,Op.posh Nocturne No.20 in C sharp minor,Op.posth. Nocturne No. 20 in C-sharp minor, op. posth Nocturne No.20 in C sharp minor,Op.osh Nocturne No.20 in C sharp minor,Op.osth. Chopin: Nocturne No.20 in C sharp minor, Op.posth.;