There’s not much of a built-in audience for music from Cape Breton, Canada, but fiddler Natalie Mac Master has created a worldwide fan base by touring relentlessly and continually keeping fans entertained with albums that alternate between traditional music and fusion. On her latest, Mac Master writes compositions that are rooted in Cape Breton’s tradition, but also brings in subtle modern touches: both electric and international sounds. Mac Master once again shows herself to be a fiery player, whether shredding the bow with the spirit of a rock guitarist or pepping up an old barn-dance style. She slows down for an elegant tribute to the late Peter Jennings, but her “Danny Boy” with Michael McDonald seems bound for the icks files. With Yours Truly, Mac Master shows herself to be one of the consistently entertaining instrumentalists in traditional music today, even as she pushes the tradition into new territories.