Belgium's 200 Franc (before Euro) featured Adolphe Sax, founder of the saxophone, the instrument which took after his name, sometime in 1840s.

Belgium (front) - 1995 200 Franc - portrait of Adolphe Sax

Quote Wikipedia "The period around 1840 saw Sax inventing the clarinette-bourdon, an early (and unsuccessful) design of contrabass clarinet. Most significantly, at this time he developed the instrument for which he is now best known, the saxophone, patented in 1846.....

Belgium (back) - 1995 200 Franc - portrait of Adolphe Sax

... The saxophone was invented for use in both orchestras and concert bands. The composer Hector Berlioz wrote approvingly of the new instrument in 1842. By 1846 Sax had designed, on paper at least, a full range of saxophones (from sopranino to subcontrabass). Although they never became standard orchestral instruments, the saxophones made his reputation, and secured him a job teaching at the Paris Conservatoire from 1867."

Read the full article Wikipedia article 'Adolphe Sax'