Could this be a palafoxia? Maybe P. texana?
This smilax-looking vine was growing up a small purple-flowered forb (observed here: https://www.inaturalist.org/observations/5545436)
Wild snailseed vine growing alongside cultivated creeper & passion vine.
Taken on Pines and Prairies Land Trust's Yegua Knobbs preserve during an open day, in Bastrop County.
And other birds on this recording
And other birds on this recording
And a painted bunting is on this recording