Up to 30% of an average Sunday service can be singing or other music. Unless your preacher is paid by the minute, of course, when anything is possible and Sunday roasts risk being burnt.
This is a guesstimate, but one born of long experience. If you count 5 hymns (at least three minutes each) plus introits and music over communion, sung liturgical prayers (if that is your tradition), chants or background music for prayers or readings (if that is yours) or the inevitable organ voluntaries (for traditions that are left) it is easy to see how an hour-long service can contain 20 minutes or more of music. Where would worship be without it?
Possibly better off, I venture to suggest, without at least some of it. And this is a musician talking. First, that music before the service. What is wrong with silence (for prayer)? Or chatting for that matter (for fellowship)? If a musical signal is required, ten seconds of musical 'worship alert' in an appropriate mood could be as effective, and more appropriate, than minutes of liturgical muzak whose only function is to stop at a given signal to indicate that the 'real thing' is about to start.
And then those hymns, or at least any of them with more than four verses. Those little asterisks mean something - these verses are optional. Yes, the president must announce which verses are not to be sung! There is nothing in canon law against it, I assure you. Hymns of five and six verses(or heaven preserve us, more than six verses) are justified only in vast buildings, where liturgical processions take time, or in ordinary churches at the offertory/collection where there is most liturgical action to cover, or where the words really are of exceptional quality (which is rarer than we think). Five verses of a six-line hymn between the epistle and the gospel is a distraction from the sequence of the readings, not an opportunity to praise God. For many small congregations, two or three verses for an opening or closing hymn will be perfectly adquate, and would avoid the spiritual suffocation of lurching one's way through yet another verse of a mediocre (but thematically impeccable) hymn sung too slowly by an uncertain and scattered group of worshippers.
Music over communion can of course be beautiful. But once in a while, let us remember that it is silence, not music, that is golden. Once a month give the organist, music group or choir a rest. And not for a whole liturgical season, please. Sundays in Lent are not fast days, musically or in any other way.
Background music for prayers and readings, or chants between them, are a matter of taste. But let it be good taste, and ring the changes here as in any matter of aesthetic judgement. Liturgical seasons offer opportunity here, however un-liturgical you may feel.
To summarise, rather than adding music (or words) to our worship, look for opportunities to introduce more silence. This is a whole topic in itself. But does it take a musician to appreciate the value of no sounds at all as a spiritual experience? One motto for improvising musicians goes: 'Before you make a sound, ask yourself if it will be more meaningful than the silence it will break.'
Good advice for liturgists. And if you will forgive the musical pun, sometimes a rest is as good as a change.