One is the Indigo bunting which I have a hard time getting pictures of for some reason. They don't actually show much color until the sun shines on them.
The other bird I often see at power lines this time of the year is a species that reminds me of a show I used to watch in the 70's. The name seems to have slipped my mind. Little House on the something?
Anyway, the Prairie Warbler is one of my favorite warblers for 3 reasons. 1) because they are kind enough to hang around at a height where you don't have to bend your neck up to the sky to find them. 2)They have a distinct ascending call that reminds me of the sound of water being poured into a tall glass. 3) The third reason is that they are nicely marked and colorful!