Ameerah is actually the performers name for Astrid. She was one of the revelations and participants of Idol in Belgium back in 2003. She did not win or either make it into the top ten but the year after in 2004 she appeared under her name 'Astrid' in one of the preselections for Eurovision with a song called 'Don't You Stop the Music'. She did not win either but she did get through to the final. The past few years she moved to the US to start working on an international career and 'The sound of missing you' is the first result. Hope this helps :)
I thought that she's an r'n'b artist when I first heard "The Sound Of Missing You (TJ's Candlelight Mix)" tagged as 'normal version' but I must say that the Radio Edit also rocks (pure dance/pop It reminds me of Ann Winsborn)
Now there's one thing bothering me - I'm not able to find any details about her!