Eph5:19- Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord
HEART OF WORSHIP
If when worshipping God (as a minister or a worshipper), you are logical about it and your priority is on the solfa notes, the modulations and ad-libs, the instrumentation, how tush, prim and proper you look; then you are not yet at the farthest brink of the core of worship to God.
Worship to God especially via songs is to be done in Spirit and in Truth, in all sincerity. It's not an activity, it is not make belief, it is not acting… it's a product of a life that worships God off-stage. As a minister or a worshipper the secret place is the best place to worship God.
Worship is not about YOU it is about GOD, let your focus be on Him. You can worship God by singing in tongues, how melodious your voice sounds doesnt matter, JUST WORSHIP.
Worship God in songs anyhow you are led not minding your voice.