For frontman Ben Bridwell and his skyrocketing indie rock group Band of Horses, it has been a wild year and a half. The group rolled out its debut LP, Everything All the Time in March of 2006 to widespread acclaim and has ridden that reception to nation-wide tours, a pair of performances on “The Late Show with David Letterman,” placement on CBS hit show “Criminal Minds,” video game soundtracks and even a Wal-Mart ad.