Some of these sources will have more spectra than others. And some of these will point you to spectra in the literature.
Don't forget about Reaxys & SciFinder as sources of spectra.
Communication is divided into three parts - Words, Vocal Elements, and Nonverbal Elements
These parts are not equal partners in communication. Their contribution is roughly
In other words, vocal elements convey roughly 5 times more information than words. And nonverbal elements convey roughly 8 times more information than words. Therefore, it is extremely important that all the parts work together in communicating a message.
Below are seven videos providing examples of when the vocal elements doesn't support the words. I call it upvoice but others call it uptalking or high rising terminals.
A quick example of uptalk (0:40)
Can you hear the difference? If not, then replay this video.
Uptalk in Public Speaking (1:36)
First impressions - Add to your credibility and authority as a speaker
How does your tone indicate or reinforce a question, a statement, and a command?
Does Uptalk Make You Upchuck (4:29)
What is the presenter's view of upvoice in the workplace?
Between 1:00 and 1:50, how many times do you hear upvoice?
Do you have upvoice?
Speak with Conviction (2:45) by Taylor Mali
According to Taylor Mali, what should you avoid when speaking?
How to minimize uptalk (7:53)
Five techniques to help you minimize uptalk