Thuja occidentalis - aka White cedar, Arborvitae, easy enough to find ready to plant at the height you need. The tall upright types would work like 'Degroot's Spire'
Or, just mow lilacs down to just below the broken points. New shoots from roots. Will be at height within 3 years, maybe even first year. Really this is the easiest.
Bamboo - in zone 5b I suggest Phyllostachys atrovaginata or Phyllostachys aureosulcata forma aureocaulis or forma 'Spectabilis' - yes, you absolutely must put in a barrier to contain the rhizomes, it would be irresponsible to let them loose in the ground. The bamboo listed are reliably hardy in zone 5b, my plantings are 30+ years old. I'm 40 miles north of Chicago. Height in zone 5b will max out at 18 feet. Usually 8 to 12 feet. Over the years, 3 out of 5 years the bamboo stays evergreen. Rhizomes are hardy to -25F. with just 6 inches of mulch on top, even after total top winter kill, new shoots from rhizomes will reach full height in about 3 weeks. Yep, my bamboo shoots poke their noses above ground in early May and by end of May have topped out at 8 to 12 feet. When I've had several mild winters in a row, the new shoots will reach 18 feet. The colder the winter and the shorter the growing season, the lower the final height. They need water, supplement water any week you have less than one inch of rain while shoots are developing, especially May through to August or September.
I suggest a horse watering trough partially or fully buried in the ground as your barrier. Drainage holes only in the very center of the bottom as rhizomes tend to circle the outsides of the container. Rhizomes seldom go straight down. They tend to go out and down. So if the bottom of the container you are using as a barrier was a target, the drainage holes should only be in the bullseye area. The barrier needs to be sturdy, bamboo rhizomes can pierce a child's plastic wading pool. Cross linked or HD polyethylene should be at least 3/16 inch thick, 3/8ths is better. I have also used plastic 55 gallon barrels, cut off at about 24 to 30 inches. Drainage holes in the "bullseye" id the bottom of the barrel were a target. DO NOT PLANT BAMBOO LOOSE IN THE GROUND. In 20 years a bamboo planting without a barrier will be a major project to dig up out of bounds rhizomes. Shoots that come up out of bounds can be harvested for the kitchen table. Bamboo shoots are excellent eating, and hard to find fresh shoots. Until you have had stir fry with bamboo shoots less than a day out of the ground you have not lived. I also steam them like one would asparagus.
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