Jonathan's second instrument is his voice. ​He can be heard playing and singing solo at venues throughout the UK.

 

His 2003 solo album, Wishbone, features songs by Duke Ellington and Billy Strayhorn.

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In 2022 Jonathan released a highly acclaimed vocal album, The Lions Revisited, and regularly sang Upstairs at Ronnies, and at Pizza Express's Piano Lounge, as well as at gigs in Finland and Italy. ​​​​​​​​​​​​​​​​​​​​​