Nigun waltz Arranged and Played on a classical Guitar by Yaakov Kranz the "Kumzitzer Rebbe".

I tried to find out who composed this "Nigun" (Song) and someone said it was composed by הרה"צ ר' יצחק הורוויץ זצ"ל and has been attributed to the Bovov dynasty. Others thought possibly not. If you know the true composer, Please comment below. Thank You!
Yaakov Kranz "Kumzitzer Rebbe".