Leather Oak. Pear Galls are found on the midrib of the ventral vein and in Russo are described as green when young. This one is neither. However, there are several other observations of this gall in iNat:
https://www.inaturalist.org/observations/95827454
https://www.inaturalist.org/observations/60111839
Its singing was staccato and delicate.
Im not sure waht these red things are