The mishna teaches: The minors would not engage in playing a lyre and in playing a harp; rather, in singing with the mouth in order to provide flavor to the music with their pure, high voices. The Gemara notes: That is to say that a lyre and a harp are two distinct instruments. Let us say that the mishna is not in accordance with the opinion of Rabbi Yehuda, as it is taught in a baraita that Rabbi Yehuda says: The harp used in the Temple was an instrument of seven strings, as it is stated: “In your presence is fullness [sova] of joy, in your right hand sweetness for evermore” (Psalms 16:11). Do not read the word as “fullness [sova]” but as seven [sheva]. This indicates that the “sweet harp” (see Psalms 81:3) played in the presence of God, i.e., in the Temple, has seven strings. Rabbi Yehuda continues: And the harp that will be played in the days of the Messiah will have eight strings, as it is stated: “For the Leader, on the eighth: A Psalm of David” (Psalms 12:1). This indicates that the psalms that will be recited in the time of the Messiah, son of David, will be played on the eighth string that will be added to the harp. And the harp that will be played in the World-to-Come will have ten strings, as it is stated: “A Psalm, a song. For the Shabbat…With an instrument of ten strings and with the lyre, with a solemn sound upon the harp” (Psalms 92:1–4). This indicates that in the World-to-Come, which is comparable to Shabbat, songs of praise to God will be played on a ten-stringed instrument, identified here as both a lyre and a harp. And similarly, another verse states: “Give thanks unto the Lord with the harp; sing praises unto Him with the lyre of ten strings. Sing unto Him a new song” (Psalms 33:2–3), which is referring to the new song that will be sung only in the World-to-Come. This proof in support of Rabbi Yehuda’s claim that the harp used in the World-to-Come will have ten strings is from a verse that is referring to a ten-stringed lyre, which shows that according to Rabbi Yehuda, the lyre and harp are the same instrument. Therefore, his opinion apparently contradicts the mishna.

A harp was hung above the bed of David, and once midnight arrived, a northern wind would blow on it, making its own melody. David awoke at once and delved into Torah until dawn broke...