Yost is a composer who lived from 1754-1786. According to Schwann Opus,
he composed his work with Johann Christoph Vogel (1756-1788). Apparantly,
he wrote at least eleven Concertos for clarinet & orchestra. I'm not sure
where he is from.
His recordings are on only one disc. MD & G 3010718. It has Dieter
Klocker playing the Clarinet with the Prague Chamber Orchestra.
Hope this is of some help
Daryl Loomis <[log in to unmask]>