Liam Gallagher , singer of Britain 's top rock group Oasis , flew out on Thursday to join the band three days after the start of its U.S. tour .
<response> <person>Liam Gallagher</person> , singer of <location>Britain</location> 's top rock group <organization>Oasis</organization> , flew out on Thursday to join the band three days after the start of its <location>U.S.</location> tour . </response>