Billy Joel is "not ready to retire" amid his normal pressure hydrocephalus diagnosis, sources tell PEOPLE. The singer announced on Friday, May 23, that he would be canceling his upcoming concerts after previously postponing shows through June.

Earlier this year iconic model Christie Brinkley debuted her new memoir, Uptown Girl, where she discussed her own life while detailing failed marriages with Peter Cook and musician Billy Joel - among other things.

Last week, the 76-year-old musician announced that he was diagnosed with the rare brain condition and had to cancel the remainder of his tour.

And we’re always in the mood for your melodies and we all hope you’re feeling alright," Brinkley wrote to the musician, referencing the lyrics from one of his most famous songs Billy Joel can always count on Christie Brinkley to be in his corner.

Billy Joel has been diagnosed with the brain disorder Normal Pressure Hydrocephalus Diagnosis and has cancelled all of his upcoming concerts.

Billy Joel's normal pressure hydrocephalus diagnosis leads to concert cancellations as he faces challenges with vision, hearing and balance requiring therapy.