This video discusses why nonsensical words/sounds, singsong pitch, and conversational (or serve & return) style of speaking and singing to baby is important. https://www.reuters.tv/v/PNUs/2018/12/28/baby-talk-could-be-vital-to-child-development
Kindermusik provides guidance, lots of material (books, music, activities), and a safe place for support/practice/exploration.