BUCHAREST, Romania (AP) — The award-winning U.S. guitarist Al Di Meola suffered a heart attack in Romania’s capital but is currently in a stable condition and receiving treatment, a hospital spokesperson said on Thursday.

Di Meola, 69, began playing a concert at a venue in Bucharest at 9 p.m. on Wednesday night. In a statement, the Bagdasar-Arseni emergency hospital said he was admitted to a cardiology ward where he is being treated for a segment elevation myocardial infarction, or STEMI.

It is not clear exactly at what time his health condition arose.

According to the healthcare website Cleveland Clinic, a STEMI mainly affects the heart’s lower chambers and “tend(s) to be more severe and dangerous compared to other types of heart attack.”

Di Meola’s decades-long career has earned him widespread critical acclaim and awards including a Grammy. One of Di Meola’s most popular tracks is “Mediterranean Sundance,” which was part of his 1977 album, “Elegant Gypsy.” According to his official website, he has sold more than 6 million records worldwide.