By Tobias Carroll No matter the genre, musicians learn from one another. Go deep enough into the history of popular music and you’re likely to find examples of this, whether it’s Ken Burns delving into the roots of country music or Dave Grohl chronicling the artists that helped shape the Foo Fighters. Sometimes, influence can be a more general or aesthetic decision; at others, it might relate to a very specific note, chord or technique. That’s certainly the case when it comes to Paul Rodgers, best known for his work as the vocalist in groups like Bad Company and Free. In an interview with Ulti…