Music Show finally gained due reward for a string of consistent efforts with an impressive victory in the Etihad Airways Falmouth Stakes at Newmarket.
Mick Channon's filly did not enjoy the best of luck in the English and Irish 1000 Guineas or the Coronation Stakes so far this season.
Settled in the rear by Richard Hughes, on board for the first time, the 13-2 shot was always travelling sweetly.
Kieren Fallon made sure it was a real test of stamina on Spacious when he took over at the head of affairs from Strawberrydaiquiri at halfway.
Spacious had everything else covered but had no answer to Music Show's turn of foot and she went on to win by two lengths with Mark Johnston's Rainfall running well in third.
Favourite Lillie Langtry and dual Guineas victor Special Duty were bitterly disappointing in finishing out of the frame.
Hughes said: They went nice and fast today and she did it very well.
"Mick kept telling me she'd had no luck in running and I'd been watching her, she was forced wide at Ascot because of her draw but she was very good today."
Channon added: "After Ascot I was in bits because she had no run at all but she's a class filly. She's just been unfortunate in lots of races but she's put it right today in what is probably the best fillies' race of the year - she put it right in style.
"In Ireland she was in daylight the whole way but today everything went great, he could sit in behind and take his time. We wanted to give her a chance and she's done it really well."
Channon is now eyeing a clash with nine-time Group One winner Goldikova or another trip to Ireland.
He added: "We will have a look at the Matron Stakes (Leopardstown, September 4) and also have a think about the Prix Rothschild in Deauville (August 1) where we can have a go at Goldikova. She's the top dog and that's what it's all about, having a go at those sort of horses.
"She's in the Nassau and everybody keeps saying she wants a mile and a quarter but I'd be happy to leave that until next year."
Criquette Head-Maarek said of Special Duty: "She didn't run her race. Maybe something will come out but I don't know. She's been working very well but she's walking like a dead horse.
Aidan O'Brien was also perplexed by Lillie Langtry's performance, adding: "I'm not really sure what happened. We'll just have to wait and see.
"Johnny (Murtagh) said she just didn't pick up but for what reason we'll just have to see."
James Fanshawe said of Spacious: " She ran very well and I'm not at all frustrated.
"Kieren gave her a great ride and there are no excuses - she ran a very good race. She has finished in front of some very good fillies today.
"It's great to have her in the yard. I will probably give her a break now and have a look at going to the Matron Stakes."
Mark Johnston said of Rainfall; "You could not have predicted that result. We said we were shooting slightly in the dark as it was a big jump up in class for her, but she deserved to run in a Group One and is clearly a Group One filly.
"Her next run will be at Group One level too, it could be in the Prix Rothschild, depending on how she comes out of this race."