Scissor Grinder Cicada (Neotibicen pruinosus). 

The scissor grinder’s name was a little more appropriate when it was common practice to sharpen cutting implements with a specialty grinding stone, now the name is a bit anachronistic. Unlike the small, orange-winged periodical cicadas, the Scissor Grinder Cicada can be heard every year. In Illinois, it emerges a little after the summer solstice and graces hot summer evenings with its oscillating call all the way through to the fall. 

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Scissor Grinder Cicada audio recorded by Brodie Dunn 

Sources and more: 

• Common True Katydid. Songs of Insects. Available from http://songsofinsects.com/katydids/common-true-katydid. 
• Common True Katydid. Missouri Department of Conservation. Available from https://mdc.mo.gov/discover-nature/field-guide/common-true-katydid. 
• Common True Katydid (Pterophylla camellifolia). Singing Insects of North America (SINA). Available from https://orthsoc.org/sina/141a.htm.