עֲשָׂרָה נִגּוּנִים — מֵהֶם תְּנוּעוֹת בִּלְבָד — מְיוּחָסִים לְרַבֵּנוּ הַזָּקֵן שֶׁהוּא בְּעַצְמוֹ חִבְּרָם

There are ten melodies, some of them merely melodic phrases, whose composition is ascribed to the Alter Rebbe.

הַמְיוּחָסִים לְרַבֵּנוּ הָאֶמְצָעִי, הַיְנוּ שֶׁנִּתְחַבְּרוּ בִּזְמַנּוֹ וְהָיוּ מְנַגְּנִים אוֹתָם לְפָנָיו

Those ascribed to the Mitteler Rebbe were composed in his time and were sung in his presence.

אֲבָל לֹא שֶׁהוּא מְחַבְּרָם

He was not their composer, however.

"וְהָיְתָה אֶצְלוֹ קְבוּצַת אַבְרֵכִים מְנַגְּנִים — וִידוּעָה בְּשֵׁם "דעֶם מִיטעֶלעֶן רֶבִּי'ס קאַפּעֶלעֶ

He had a group of musical young men who were known as "the Mitteler Rebbe’s choir,”

— וְנֶחְלְקָה לִשְׁתֵּי פְּלוּגוֹת: בַּעֲלֵי שִׁיר — בְּפֶה, וּבַעֲלֵי זִמְרָה — בְּכֵלִים שׁוֹנִים

which comprised singers and various instrumentalists.

Text and Translation courtesy of Sichos in English