paralleling popular music, though some churches play the same songs with simpler or acoustic instrumentation. The role of technology Technological advances have played a significant role in the development of CWM. In particular the use of projectors means that the song repertoire of a church is not restricted to those in a song book. Songs and styles go in trends. The internet has increased accessibility, enabling anyone to see lyrics and guitar chords for many worship songs, and download MP3 tracks. This has also played a part in the globalisation of much CWM. Some churches, such as Hillsong, Bethel and Vineyard, have their own publishing companies, and there is a thriving Christian music business which parallels that of the secular world, with recording studios, music books, CDs, MP3 downloads and other merchandise. The consumer culture surrounding CWM has prompted both criticism and praise, and as Pete Ward deals with in his book "Selling Worship", no advance is without both positive and negative repercussions. Criticisms Criticisms include Gary Parrett's concern that the volume of this music drowns out congregational participation, and therefore makes it a performance. He quotes Ephesians 5:19, in which Paul the Apostle tells the church in Ephesus to be 'speaking to one another with psalms, hymns and songs from the Spirit', and questions whether the worship band, now so often amplified and playing like a rock band, replace rather than enable a congregation's praise. Seventh-day Adventist author Samuele Bacchiocchi expressed concerns over the use of the "rock" idiom, as he argues that music communicates on a subconscious level, and the often anarchistic, nihilistic ethos of rock stands against Christian culture. Using the physical response induced by drums in a worship context as evidence that rock takes peoples' minds away from contemplating on the lyrics and God, he suggests that rock is actively dangerous for the Church. The theological content too has raised questions for some, including Martyn Percy, who argues there is too great an emphasis on a very intimate relationship with God, using terms such as 'I' and 'you' instead of 'we' and 'God', and very passionate, physical language, and argues that this bias needs urgent correction. He explains how the emphasis on emotion can encourage hype and a need to create an atmosphere which evokes a sense of encounter with God, rather than allowing God to do so. Despite the biblical basis employed to underpin CWM,