B8 new song 2018

You're looking for a new song from 2018 that starts with the letter "B"!

Here are a few suggestions:

1. "Bad at Love" by Halsey (released in August 2017, but gained popularity in 2018)
2. "Bloodlines" by The 1975 (released in February 2018)
3. "Better Now" by Post Malone (released in April 2018)
4. "Breathe Me" by Sia (released in June 2018)
5. "Boy With Luv" by BTS feat. Halsey (released in April 2019, but gained popularity in 2018)

Let me know if you'd like more recommendations or if you have a specific genre or artist in mind!