the first series theme song is was when i grow up by the pussycat dolls
and The lastest series theme song is Lose Control by The Saturdays,
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If its the same song that recently came out . The artist is is called train -Marry me. the album save me sanfrancisco
love you
Marry The Night
Ollie Murs first song was "Please Don't let me go"
YES; he marries her in an alternate time line that then reverts making the marriage null and void in the episode "The Wedding of River Song".