The term 'NOVA LEAD-IN' can be summarized as a five letter word, 'BOSSA'. This word is derived from the Portuguese word 'baússa nova', which translates to 'new trend' or 'new wave'. It is used to describe a style of Brazilian music that combines elements of jazz and samba. The term is often associated with the work of Antonio Carlos Jobim, a Brazilian composer and musician who popularized the genre in the 1960s.