Yisro couldn’t bring himself to sing songs of thanksgiving. The news gave him the chills! However, he was able to see that this was all the Yad Hashem, and it is for this reason that it is specifically through Yisro that we are shown the importance and significant implication of saying “Baruch Hashem.”
Hashem, in His great love for the Jewish people, has given them 248 dos and 365 don’ts in order for them to reach the levels of greatness that they were created to achieve, and to merit the ultimate reward, ‘דביקות בה – closeness to their loving Father in heaven.
The shminis that is to be played l’asid lavo will come into existence when we once again achieve the great level of achdus that we are truly capable of; a level that we so excellently exhibited when we initially accepted the Torah. When that day comes, the 8th note will be heard; The perfect unity of music, symbolized by the perfect unity of mankind.