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Note: If you want it to sound a little less minor, change the Am to a C at the end of the 1st, 4th and 5th lines, like I have in the last verse.
O cAmome, O come, Em-GmaEmn-u-Amel And rCansom captive DmIs-G--raAmel That Dmmourns in lonely CexEm--ile Ghere Un-Amtil the Son of DmGod Ga-ppAmear Re-Gjoice! Re-Amjoice! EDmm-mGan-u-Amel Shall coCme to thee, DmO IsEm--ra-Amel.
O cAmome, Thou Rod of JGe-Emsse, fAmree Thine oCwn from Satan's Dmty-G-raAmnny From Dmdepths of Hell Thy pCeo-Emple sGave And gAmive them victory Dmo'er tGhe gAmrave RejGoice! Re-jAmoice! EmDm-maGn-u-Amel Shall coCme to thee, DmO IsEmrael.Am
O cAmome, Thou Day-Spring, cGomeEm and cAmheer Our sCpirits by Thine Dmad-vGent Amhere DispeDmrse the gloomy cCloEmuds of nGight AndAm death's dark shadows Dmput Gto fAmlight. Re-Gjoice! Re-Amjoice! EDmm-mGan-u-Amel Shall coCme to thee, DmO IsEm--ra-Amel.
O cAmome, Thou Key of GDavEmid, Amcome, And oCpen wide our hDmeaveGnly Amhome; Make Dmsafe the way that lCeaEmds on Ghigh, And cAmlose the path toDm miG--sAmery. Re-Gjoice! Re-Amjoice! EDmm-mGan-u-Amel Shall coCme to thee, DmO IsEm--ra-Amel.
O cAmome, O cCome, Thou LoGrd Emof mCight, Who tCo Thy tribes, on DmSinGai's hAmeight, In anDmcient times did'st Cgi-Emve the LGaw, In Amcloud, and majeDmsty aGnd aCwe. Re-Gjoice! Re-Amjoice! EDmm-mGan-u-Cel Shall coCme to thee, DmO IsEm--ra-Amel.
I usually mute the high E string on the G chords, except for in the 5th line of each verse. ~Enjoy!