There’s been a lot of talk around these parts about A&M Records’ 50th anniversary celebration, and why not?  The label founded by Herb Alpert and Jerry Moss virtually defined the sound of AM radio in the 1960s before embracing cutting-edge new wave , rock and R&B sounds in the ensuing decades.  And that’s just the tip of the iceberg.  When one thinks of the A&M Sound, however, those bright and breezy sixties pop songs just might be the defining style.  With the phenomenal success of Herb Alpert and the Tijuana Brass paving…