August 2021: Mid-summer is an ideal time to update a music library, add some new songs to the gym playlist, or discover a new tune you’ve never heard before. From Top 40 pop, easy listening to disco, salsa and down boogie, here are 8 selected songs with a sunny mood to sample and enjoy. Early morning soundtrack, lounging outside, road trip repeat, sundown special, socializing/get together worthy?  Listen. Decide.…