I did realize that; sorry if I was being too exclusive with Catholicism, I was just arguing from my perspective.
To be honest I am not nearly as versed in Tradition as I am in Scripture, as I am a pretty new convert (in fact not even an official one yet) to Catholicism. I was not aware that everyday hymns were considered Holy Tradition, as opposed to just individual traditions that one particular rite may prefer, etc. I have also always been taught that there is a distinction between an angel and a cherub. However, you do make a good point, and I'll have to look into it further.
FerventGodSeeker
Unlike the RCC we don't really have 'everyday hymns', so I can't say whether or not you would consider them to be the sort of hymnography that constitutes a part of Holy Tradition. You'd have to ask a fellow RC about that. Our Liturgical hymnography is, however, considered part of Holy Tradition and the major ones are very ancient (though the music to which they are set has evolved over time). The Cherubic Hymn was added into the Liturgy of St. John Chrysostom (which is our usual Liturgy) in the 6th century, so this is no exception.
As for there being a distinction between angels and cherubs, you are half right. Angels is used both as the overarching term and as a specific rank of angel. As cherub is also an angelic rank, there is a distinction here, but that doesn't mean that they aren't angels in the overall sense. The ranks of angels are: thrones, cherubim and seraphim (closest to God), virtues, dominions and powers (further out from God), and angels, archangels and principalities (closest to man). I'm not sure whether or not the RCC teaching is quite as clear as ours on this, but as this is based on both Scripture and the Fathers (especially St. Dionysios the Areopagite), I would imagine so. Here's a link that explains (from an Orthodox perspective) the ranks of the angels:
http://www.sfaturiortodoxe.ro/orthodox/orthodox_advices_angels.htm
James