'bespoke instrument' is a correct and usable phrase in written English.
It may be used to refer to an instrument designed and made to specific requirements, often for a particular individual or purpose. For example: "This bespoke instrument was crafted over the course of a year to meet the exact specifications of the client."
The sounds of the bespoke instruments are not so out there actually, harp, organ, gamelan.
At the time, Montclair State University held the remarkable array of bespoke instruments — strings, keyboards, and percussion — that Partch had devised for his music.
This time, the booming voice of Sir David Attenborough introduced videos about nature to a soundtrack of bespoke instruments controlled by iPad apps, including a pendulum that plucked strings as it swung, and a giant Tesla coil that emitted a bone-rattling melody, unamplified.
I last heard Partch's music live in 2005, when the Kasser Theatre, in Montclair, New Jersey, presented the composer's mystically transporting adaptation of William Butler Yeats's "King Oedipus". At the time, Montclair State University held the remarkable array of bespoke instruments—strings, keyboards, and percussion that Partch had devised for his music.
They used these to develop a bespoke evaluation instrument based on questions from the existing tools and from their clinical knowledge.
Smart investors preferred to make bearish bets via more bespoke instruments.
He makes bespoke instruments for clients, often working with them over the course of 18 months.
Forbes: Do the regulators have the knowledge if somebody's doing a bespoke derivative, so to speak, to know what kind of capital requirements to put on those bespoke instruments?
The study aimed to develop a bespoke quantitative measurement instrument (and qualitative feedback tool) with construct and discriminant validity, and the ability to consistently measure safety culture in ANSPs throughout Europe, and facilitate safety improvements in air traffic management.
