Complex sentence: The songbook, written in 1789, includes the musical notation of the songs and is the single most important source on the early tradition of Classical Andalusian music and the Malhun, it also contains the names of the authors of the poems and melodies.
Split into simpler sentences: The songbook, written in 1789, includes the musical notation of the songs and is the single most important source on the early tradition of Classical Andalusian music. It also contains the names of the authors of the poems and melodies.