On Sunday, the music industry will gather in Los Angeles for the annual Grammy Awards, billed in commercials as “music’s biggest night.” A half-dozen Seattle musicians are up for awards this year, including Brandi Carlile, Chris Ballew and Jeff Ament. Winning a Grammy is a surefire way for a band to boost sales, but in an era when just making a living is a struggle for most musicians, dreaming of fancy awards is secondary to paying rent