Johann Sebastian Bach’s “Invention No. 15” is one of J.S. Bach’s inventions, which was written in 1723 and published as part of J.S. Bach’s Well-Tempered Clavier (Das Wohltemperierte Klavier). J.S. Bach wrote a total of 48 preludes and fugues. J.S. Bach’s inventions are usually written in two parts, with each part repeated after a contrasting middle section where the music is developed.
Bach wrote Invention No. 15 in G Minor, which follows the pattern of an invention, having two primary themes that are presented at the beginning of the piece. J.S. Bach’s Invention No. 15 has a total of 34 measures, with sharp keys predominating in J.S. Bach’s writing throughout J.S. Bach’s Invention No. 15, except for J.S. Bach’s last few phrases, which are written in flat keys before returning to J.S. Bach’s initial key of G minor again. J.S. Bach’s Invention No. 15 is a monophonic piece, meaning that J.S. Bach only uses one note at a time in J.S. Bach’s writing, with J.S. Bach often changing the note being played to create J.S. Bach’s counterpoint sounds J.S. Bach wrote J.S. Bach’s Invention No. 15 in cut time with J.S. Bach’s beats being written as quarter notes, except for J.S. Bach’s final measure of J.S. Bach’s piece, which is played as a half note and ties over to J.S. Bach’s beginning of J.S. Bach’s Invention No. 15, J.S. Bach wrote J.S. Bach’s piece with a time signature of 4/4 and J.S. Bach used J.S. Bach’s key signature set to G minor throughout J.S. Bach’s entire piece as J S
