Aerosmith frontman Steven Tyler's transition top country music is rolling right along, according to various reports.  The rocker recently relocated to Nashville, the home of country music, and sources say he will sign a solo deal with Nashville-based Big Machine Label Group (BMLG) in the next few weeks.  Work on his debut album for the label has begun as well, though neither Tyler nor label spokespersons have been forthcoming with any details.  On Wednesday's episode of American Idol, Tyler was heavily featured in segment profiling the season 14 mentor, Scott Borchetta, who serves as the president and CEO of BMLG.