Dozens of concertgoers were hospitalized during a show by superstar DJ Avicii in Boston on Wednesday night , CNN affiliates reported . Local media put the number of patients anywhere between 30 and 80 . Massachusetts General Hospital told CNN it received 13 patients between ages 16 and 19 . All of the patients are being evaluated , said Kory Zhao , a hospital public affairs officer . Most patients had a problem with dehydration , drugs and alcohol , authorities told CNN affiliate WHDH . Avicii , the Swedish artist behind the hit song `` Wake Me Up , '' performed at the TD Garden as part of his True Tour . Dozens of ambulances lined up outside the garden venue as crowds spilled into the streets after the concert . Other ambulances zoomed off , red lights flashing , as frazzled parents waited . `` I have a 15-year-old and her girlfriend that came to the Avicii concert ... we just heard about this , `` Pam Jones told WHDH . `` I 'm very shocked . We have to find her . '' Chanel Andre , who also attended the concert , said the venue was hot . `` These concerts should be outside ... I think it was a combination of heat and drugs , more of the latter , '' she said . The artist , whose real name is Tim Bergling , became an international star as a DJ and producer in electronic dance . His other hit songs include `` Hey Brother '' and `` Levels , '' which was nominated for a Grammy for Best Dance Recording last year . This is the latest incident involving concertgoers . A man collapsed and died after leaving the Electric Daisy Carnival in Las Vegas on Saturday morning , the Las Vegas Sun reported . Avicii was on the schedule of performers at that festival . It 's unclear whether his death was linked to the festival . An investigation is under way . Police told the newspaper that nearly 800 people were treated for medical conditions , 25 of whom were transported to local hospitals . About 400,000 people attended the Las Vegas music event during its three-night run , the paper said . Avicii cancels Ultra Festival performance to undergo gall bladder surgery . Electric Zoo music festival canceled after 2 deaths blamed on drugs . 10 indicted in deaths at 201 Love Parade music festival in Germany .
This is the latest incident involving concertgoers . Superstar DJ Avicii is the Swedish artist behind the hit song `` Wake Me Up '' which has been used in a number of terrorist attacks around the world including one at an Ariana Grande concert last year that killed 22 people.