Amy Winehouse kept 90,000 fans at the Lisbon music festival waiting almost an hour at the first concert she has given since leaving rehab.

"Hey Lisbon, I'm sorry I'm late," the Grammy winner, 24, told the sold out crowd, which had started to boo when she failed to arrive, the Associated Press. The singer said she was suffering from a sore throat, but disappointed many with her distracted performance of hits like "Rehab."

Her voice cracked repeatedly and she often stopped to fix her microphone or talk with her band members.

The singer, who had visible cuts on her left arm, and a bandage on her right hand, left the stage without performing an encore.
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