If that is the starting point then it would make sense to conclude that "too much" music is going to interfere with the discipleship/growth of the people.
On the other hand, if your church body starts with the premise that the Sunday service is first for the purpose of glorifying God and that all should participate as much as is practicable then you will not find the above ratio problematic.
This really goes back to the question of single pastor versus multiple elders. As long as the people are being fed in a planned, organized manner then the Sunday service opens up to a more participatory experience.
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Quick thought on this. Our pastor (my 8th since joining the church 30+ years ago) is the first one who would schedule a speaker (from inside or outside the church) on a Sunday that he is not away. I mentioned this to him when I first noticed it last year. The previous men were all of the mindset of "jealously guarding the sacred desk". His response? Two part - "I like to listen and learn too" and "when will the other men here have the chance to develop their pulpit gifts if I am always in the way?" He is not cut of the mould that he is the only one that God can use to move His people.
While this seems to me a small difference it is making a huge difference in our church. People are hungry and growing because our pastor has given them permission to do so without relying on him to be their only source. Men who are gifted to teach and preach are stepping up to fill this "new found" need.
This summer our Sunday school series is on faithful men of scripture. He has assigned the elders each a week to bring the lesson. He will do the first and last weeks. Other than giving them the name of the person they are to teach on and a declarative sentence fitting the narrative of that individual, he is providing nothing in the way of curriculum. If desired he will help develop a lesson but is allowing each man to study out the life of the person and bring the lesson God gives to them. I am the only elder not involved due to my camp responsibilities so I hope they tape the series.
It thrills me to see pastor intentionally and gently pushing us elders into our proper biblical role.
If all of us are actively teaching throughout the week then there may be room for an extra song of two on Sunday.