Guster is an amazing band with a really great sound. One of my favorite albums, Parachute, features some excellent acoustic guitar playing and has a really good flow to it. Their most popular album Ganging Up On The Sun is quite different than their other albums but delivers 12 excellent songs that will have you listening on repeat for days. If you are looking for a band to chill out and listen to try giving Guster a listen. I've linked some of my favorite songs below.