Gerlo is active as (jazz) saxophonist. Because of his extensive big band experience, he is a regularly asked substitute in various orchestras throughout the Netherlands (including the Metropole Orchestra) but also in Germany. Besides saxophone he plays flute and clarinet. Meanwhile, He has accompanied many internationally known artists such as Toots Thielemans, Benny Golson, Randy Brecker and Deborah Brown. As a soloist in these formations, this resulted in soloists-prices at the Big Band Festival 2008 in Hoofddorp and a year later during the Dutch Big Band Contest 2009 in Enschede.
He is also active in several small(er) instrumentation, with musicians like Peter Tiehuis, Hod O ‘Brian and Johan Plomp . He can be heard as a substitute for musicals and other theater productions, as in “Songs from the Heart” by Simone Kleinsma and ”La Cage Aux Folles”.
At the moment he is a member of "Get The Funk", "Dual City Concert Band" , "Millennium Jazz Orchestra", "JazzArt", "the Ramblers", "Holland Big Band" and "Demi-Seq".
In 2013 he recorded his first own CD titled “Garden of Stones” with a quartet with Dirk Balthaus on piano, Johan Plomp on drums and Henk Zomer on drums. This album is released may 7th 2013 and has got some nice reviews (see album description).