pa href="http://news.yahoo.com/bieber-one-direction-top-list-young-music-acts-180441921.html"img src="http://l3.yimg.com/bt/api/res/1.2/zBL1rITUBEEXafMUfpitjw--/YXBwaWQ9eW5ld3M7Zmk9ZmlsbDtoPTg2O3E9ODU7dz0xMzA-/http://media.zenfs.com/en_us/News/Reuters/2012-09-18T180441Z_1_CBRE88H1E8300_RTROPTP_2_CENTERTAINMENT-US-UNDER21.JPG" width="130" height="86" alt="Bieber performs at the 2012 Teen Choice Awards in Universal City" align="left" title="Bieber performs at the 2012 Teen Choice Awards in Universal City" border="0" //aLOS ANGELES (Reuters) - Justin Bieber topped Billboard#039;s quot;21 Under 21quot; list of the world#039;s top young musical acts for the second year in a row, fending off stiff competition from British boy band One Direction. Bieber, 18, quot;remains more powerful in the pop universe than everquot;, Billboard said, having released two No. 1 albums in the last year - holiday set quot;Under the Mistletoequot; and his latest pop album, quot;Believequot;. quot;Bieber is the supernova of teen pop stars with charisma, popularity and swagger to spare ... it#039;s Biebs#039; world, and we#039;re lucky to live in it,quot; the music publication said. .../pbr clear="all"/
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