Wolfgang Amadeus Mozart (1756–1791) was a prolific composer and wrote in many genres. Perhaps his best-admired work is in opera, piano concerto, piano sonata, symphony, string quartet, and string quintet. Mozart also wrote many violin sonatas, and other forms of chamber music, violin concertos, and other concertos for one or more solo instruments, masses, and other religious music, organ music, masonic music, and numerous dances, marches, divertimentos, serenades, and other forms of light entertainment. How Mozart's compositions are listed The indication "K." or "KV" refers to (Köchel catalogue), i.e. the (more or less) chronological (i.e. by composition date) catalogue of Mozart's works by Ludwig von Köchel. This catalog has been amended several times, leading to ambiguity over some KV numbers (see e.g. Symphony No. 25). The compositions of Mozart listed below are grouped thematically, i.e. by type of composition. Not all thematic groups of Mozart's works have a separate numbering that is generally accepted: Köchel only numbers symphonies (1 to 41), piano concertos (1 to 27, leaving out some early transcriptions by Mozart) and a few other groups. On the other hand, for most chamber music and vocal music there is no such numbering (or at least no generally accepted one). Only relatively few of Mozart's compositions have opus numbers, as not so many of his compositions were published during his lifetime, so numbering by opus number proves quite impractical for Mozart compositions. Symphonies Mozart's symphonic production covers a 24-year interval, from 1764 to 1788. According to most recent investigations, Mozart wrote not just the 41 symphonies reported in traditional editions, but up to 68 complete works of this type. However, by convention, the original numbering has been retained, and so his last symphony is still known as "No. 41". Some of the symphonies (K. 297, 385, 550) were revised by the author after their first versions. Childhood symphonies (1764–1771) These are the numbered symphonies from Mozart's early childhood. Symphony No. 1 in E major, K. 16 (1764) Symphony No. 2 in B major, K. 17 (spurious, attributed to Leopold Mozart) (1765?) Symphony No. 3 in E major, K. 18 (spurious, written by Carl Friedrich Abel) (1767?) Symphony No. 4 in D major, K. 19 (1765) Symphony No. 5 in B major, K. 22 (1765) Symphony No. 6 in F major, K. 43 (1767) Symphony No. 7 in D major, K. 45 (1768) Symphony No. 8 in D major, K.