Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Composer | Title | Genre | Date | Notes |
| --- | --- | --- | --- | --- |
| Flor Alpaerts | Salome | incidental music |  |  |
| Granville Bantock | Dance of the\nSeven Veils | incidental music | 1918 | staged London, 1918 |
| Leonard Bernstein | Salome | incidental music | 1955 | chamber orchestra with 8 players and vocal soloists; withdrawn |
| Peter Maxwell Davies | Salome | ballet | 1978 | premiered Copenhagen, 10 November 1978; Danish Radio Concert Orchestra, conducted by János Fürst; scenario and choreography by Flemming Flindt |
| Pete Doherty | Salome | popular music | 2009 | appears on his album Grace/Wastelands |
| Alexander Glazunov | Introduction and Dance, Op. 90 | incidental music | 1908 |  |
| Henry Hadley | Salome, Op. 55 | symphonic poem | 1905 | this was written after Hadley had seen a production of Oscar Wilde's play, and was a favourite among his own compositions |
| Alexander Krein | Salome, Op. 19 | symphonic poem | 1929 |  |
| Constant Lambert | Salome | incidental music | 1929 | clarinet, cello, trumpet, percussion; written for a performance staged in Cambridge by Terence Gray, with choreography by Ninette de Valois; staged again November 1931; a suite was arranged by Giles Easterbrook in 1998 and recorded in 2000 |
| Antoine Mariotte | Salomé | opera | 1905 | premiered 1908; he was involved in a debate with Richard Strauss to prove that his music was written earlier than Strauss's version, also written in 1905 |
| Emil Petrovics | Salome | ballet | 1978 | flute, trumpet, harp and percussion |
| Richard Strauss | Salome, Op. 54 | opera | 1905 | trans. Hedwig Lachmann; premiered Dresden 1905. This opera is by far the best known musical adaptation of a work of Oscar Wilde. |
| Alexander Tcherepnin | Salome | incidental music |  |  |
Question:
how many works were made in the incidental music genre?
Answer:
6