70-year-old Singh had numerous fans across the border, who had been closely following news of his illness.Such was his popularity that TV channels led their news bulletins with reports on his death while some aired special programmes on his music.
Tina Sani, one of Pakistan's best known ghazal singers who had performed with Singh in India earlier this year, was among musicians and artists who expressed shock at the passing of the maestro.
"It's a sad day and it's been more of a shock for me as I performed with Jagjit sahab in India in February and March during a series of concerts organised to mark the centenary celebration of (Urdu poet) Faiz Ahmed Faiz," Sani told PTI on phone from Karachi.
State-run news agency Associated Press of Pakistan (APP) said Singh's "silky" voice ruled during early 80's in films like 'Prem Geet', 'Saath Saath' and 'Arth'.
"However, his major work is spread over more than 60 filmy and non filmy albums," it said.
Incidentally, Singh was admitted just hours before he was to perform with Pakistani ghazal maestro, Ghulam Ali, in Mumbai on September 23.
"It's a huge loss because Jagjit Singh was instrumental in bringing ghazals to my generation. When we were younger, we heard the ghazals of Mehdi Hassan and Begum Akhtar but that wasn't really our music. It was in the 1970s that Jagjit Singh took everybody by storm and swept us off our feet," Sani said.Singh's albums released in the 1970s and 1980s, which revived and popularised the traditional ghazal genre by featuring modern musical instruments alongside Indian classical ones, continue to sell even today in cities across Pakistan.
Pakistanis also took to social media sites like Twitter and Facebook to express grief at Singh's death, describing it as a great loss for the world of music.
A comment posted in response to a news report on Singh's death on the website of The Express Tribune newspaper said: "Go well, Jagjit Singh. Thanks for the memories and melody!"
On Twitter, Afghan journalist and blogger Ahmad Shuja wrote: "Jagjit's death has saddened Pakistanis and Afghans as much as it has Indians. That's true strategic depth."
Following reports of Singh's illness, a popular cafe in Islamabad had paid a special tribute to the maestro by playing his songs and wishing him well.
"Our hearts just missed a beat," read special paper mats that were placed on all tables at Chaaye Khana cafe.
Singh had visited Pakistan in 2004, when he performed several concerts to promote peace between India and Pakistan and to raise funds for ailing ghazal singer Mehdi Hassan.
The music maestro, who rediscovered the ghazal genre for common Indian in 70s and 80s, was admitted to the Lilavati hospital. He underwent surgery but did not recover and was kept on life support. He passed away at 8.10 AM after having a "terrible hemorrhage".
Credited with freeing ghazal from the shackles of complexity, Singh brought a simplicity and lyrical quality to the genre, which was uniquely his own and instantly acclaimed by music lovers. Sani said Singh had made plans to tour Pakistan in December along with composer Gulzar before he fell ill.
"When we performed together in India earlier this year, I asked Jagjit sahab why he hadn't performed the compositions of Ghalib when he came to Pakistan.
"He responded by asking me if people would want to listen to such compositions. I told him people would love to hear him perform the compositions of Ghalib and he said he would do so when he came to Pakistan next," Sani said.