Aerosmith, a rock band, cancelled its Las Vegas residency for the first two months after Steven Tyler, lead singer, suffered a relapse and went to treatment.

According to a Twitter statement, the group that is best known for their hits “Dream On” (and “Walk This Way”) will take the stage at Park MGM starting in September according to a statement.

Tyler, now 74, is open about his past substance abuse struggles, which caused tension between him and his bandmates. Tyler revealed to People magazine that he was currently receiving pain management treatment and an addiction for prescription painkillers after a decade of performing injuries.

According to the band, the singer “had worked on his sobriety many years,” but had recently fallen back after foot surgery and “the necessity of pain management.”

The statement stated that Tyler “voluntarily entered into a treatment program to focus on his recovery and health.”

The band stated, “We are sorry that we have caused so much inconvenience for you.” “We are grateful for your understanding and support of Steven during this difficult time.