Do you have evidence?

The Founder of Sibelius Ben Finn is on LinkedIn here

This article from the Telegraph is clear that they initially sold the Acorn based system out of their San Francisco office. "… the brothers took the radical step of opening an office in San Francisco.

Though the business was still very small, the brothers managed to sell a few early packages, including the hardware, into the States, mainly into the film market, all the while laying the ground for when they would do a version that would run on Windows"

https://www.telegraph.co.uk/finance/2863793/Starting-out.html

I don’t know if this gets us much further forward, but I had a look through some old magazine and found this in Computer Shopper from December 1996.

“Michael Price from Sibelius Software put on demonstrations at the renowned Aspen and Tanglewood music festivals in the USA this summer…..”We’re all geared up to go to NAMM in Los Angeles in January with the StrongArm and all that.""

I know this thread is old, but I just came across a post on reddit where a company by the name of “Applied Photophysics Spectrofluorometer” used to sell Acorn RiscPc’s in the US. And he provides a photo of one the machines he picked up second hand years later.

https://www.reddit.com/r/retrobattlestations/comments/ag4jmw/acorn_risc_pc_us_version/

The Founder of Sibelius Ben Finn is on LinkedIn here

as is Daniel Spreadbury, who worked at Sibelius and then Avid from 1999 to 2012, on LinkedIn here. He is now responsible for Dorico musical notation software. He just might know something about Sibelius in the 1990s U.S.

Lucent had at least one A7000, according to mailing list archives for the 9fans list.

I get the impression that the cheaper, more generic Acorn systems were used as reasonably inexpensive development systems for companies looking to build on ARM. I don’t know if that’s a reasonable or accurate impression to have, however.