Before "singing hymn," one MUST take Communion as the Word of God says by "rightly dividing" His Word to determine what should be taken for Communion.
Most agree on "unleavened bread," but what was in the cup? Some would probably say "It doesn't matter (as they do with baptism), it's the "principle!" Oh, but yes it does on both accounts! If what is taken for Communion (as well as what "name" one has been baptized into) contradicts Scripture, one is in error and will NOT be "saved!"
Some say "wine" should be taken. Well, if that's so, why was Romans 14:21 written which says, "It is not good neither to eat meat nor to drink WINE, nor ANYTHING by which thy brother stumbleth, or is offended, or is made weak?" Do you think Scripture would contradict Itself and have one take something that causeth "...thy brother to stumble.." for "Communion?" Whether or not "wine" was the accepted drink "for the times then present," it's NOT to be taken for Communion! God "relates" to "man" on "man's level" for our understanding yet MOST still don't! As I told JC, if Jesus would come today, He would turn water into Coke or tea which is the "acceptable drink" for "the times NOW present" in order to "relate" to us!
Some may say "grape juice" should be taken and base their belief on Matthew 26:29; Luke 22:18; & Mark 14:25 which mentions drinking from "...the fruit of the vine..." Do you not know that "JESUS" is "the fruit of the vine" as evidenced in John 15:5? (Metaphor!)
Now, let us examine Scripture "rightly dividing His Word" as to what is in the cup given in Communion. Matthew 26:28; Luke 22:20; & Mark 14:24 all say [paraphrasing] "This is the new testament (new Covenant) IN MY BLOOD which was "SHED..." I know we learned in school that "blood" is 50% "WATER!" John 19:34 said, "But one of the soldiers, with a spear, pierced his side, and immediately came there out blood and "WATER" (SHED)! Does "water" cause "thy brother to stumble?" Did not I Corinthians 11:24 and Luke 22:19 say, "...Do this in remembrance of me...?" Not in remembrance of "fruit (literally) of the vine" or something (wine) that "causeth your brother to stumble!"
One MUST consider EVERY WORD when studying the Word of God as in baptism! Matthew 28:19 says "...in the NAME..." yet not many listen! Father is not a name, Son is not a name, and Holy Spirit is not a name. These "Titles" have a Name and that Name is JESUS! But that is another subject!
Hymn doesn't matter! Glorify Him!