Shoklen i'm not certain but i think they meant having the two songs on one macro meant that you could click it once and it would do the first song, then when you clicked it again it would stop the first song and play the second song. so it wasn't 2 songs with one keystroke but that you could use the same button to activate the two songs in an alternating manner by pressing it twice. it works like that because if you just had one song on loop and then click that spell gem directly it would stop the loop instead of casting it again. I'm just now getting back into bard with the rework having dropped so i'm not 100% but that's how i understand it.