 However, he did make one more stage appearance, unannounced, in August 2014, at the Jazz Middelheim Festival in Antwerp.Thielemans died in Braine-l'Alleud, Belgium, at the age of 94.After the announcement, the Netherlands-based jazz and pop orchestra Metropole Orkest, along with American musician Quincy Jones, performed at London's Royal Albert Hall in Thielemans' honor.