I just looked for No Sonata on equibase and it returned no results.
Depending on exactly when and where he raced in the Midwest he could’ve run at Arlington, might’ve made it to Indiana and could’ve run at Hoosier Park back when they still held TB and Standardbred races. Also possible if he was running in '03 or '04 that he was running at what’s now Indiana Grand way back when they first opened and were called Indiana Downs (the track has changed names a couple times over the years - started as Indiana Downs if I remember right, then changed hands and became Indiana Live briefly in the late '00s I think, and then changed hands again and has been Indiana Grand since).
I worked, for one season, as barn security (patrolled the barns on foot watching for anything that looked off and gathered horse in today signs, nothing glamorous, haha) at Indiana Grand about three years ago. I wouldn’t have any direct contacts there anymore, but if he raced there or trained with anyone who raced there at all, I could probably at least tell you whether I’ve heard of the trainer, which, okay, probably won’t be much use, but. I know the woman who trained my OTTB kept pretty much all her winner’s circles photos from her training career, I remember walking through her row of stalls one time and the office door was open and the walls were COVERED in winner’s circle photos.
I asked the…I don’t actually know what his job title was assuming he had one, but I’d say basically barn manager, if they had a winner’s circle photo of my horse by chance (he raced 9 times, won his first 3 all in a row and then just, I dunno, decided he didn’t want to be a racehorse, I guess, haha), told them what my horse’s jockey club name was, that I had him for a few years and he died from colic, showed them one of the photos I still have handy of him. Guy and trainer both looked at the photo and were like, “that’s him” when they saw the horse on my phone and took the time to look for one of his win photos - my OTTB had been dead since 2013 and last raced in 2008 and this was around 2018.
Might also be able to tell you what photographers/photography company the track uses - Coady is a big one in the midwest and probably the rest of the country but I think the tracks in Indiana sometimes use other photographers/photography businesses.