Communion antiphons in the missal occasionally make oblique biblical references to bread, wine, and cup. Even traditional texts such as the Corpus Christi sequence or Panis Angelicus contain portions that do not specifically spell out Catholic belief in the eucharist. When I read guidelines on the choice of text, it seems that the US bishops, as well as the Missal composers intended that the Communion Song complement the action of the procession, not necessarily explain in song just what is going on. Any poetic text without heresy would seem appropriate as a choice. I wouldn't interpret his search for a rock band leading worship as something that negates the role of the assembly.
Organists seem just as likely to alienate song when performance is primary over prayer.
Hopefully, Bob, you'll find good jamming musicians who are aware of the assembly's role and contribute to prayer and spirituality through their talent. It happens in a lot of parishes. Most eucharistic prayers, even after the institution narrative, contain language that would be suspect if every text had to explicitly reference the Body and Blood of Christ. Communion antiphons in the missal occasionally make oblique biblical references to bread, wine, and cup. Even traditional texts such as the Corpus Christi sequence or Panis Angelicus contain portions that do not specifically spell out Catholic belief in the eucharist.