By Piya Sinha-Roy LOS ANGELES (Reuters) - Country singer Luke Bryan's latest record stormed straight to the top of the Billboard 200 album chart on Wednesday, while pop singer Katy Perry scored her biggest digital song debut to date with new single "Roar." "Crash My Party," the fourth studio album from Bryan, sold more than 527,000 copies in its first week, according to figures from Nielsen SoundScan, making it his best debut. It is also the third-biggest opening for an album this year, behind Jay Z's "Magna Carta ... ...