Summer can be an expensive time. You have to book vacations, get a new bathing suit, buy sunscreen...you know how it is. Luckily, Brian O'Donovan of A Celtic Sojourn is here with his picks for the best free concerts (yes, we said free!) of the summer. Here's what he recommends:

Outside The Box Festival (July 14-19)

Gin Blossoms, "Hey Jealousy"

Guster, "Fa Fa"

Kasey Musgraves, "Pageant Material"

Lowell Folk Festival (July 24-26)

Bassekou Kouyate, "Jama ko"

Alicia Svigals, "Gasn Nign"

The Fairfield Four, "Last Month Of The Year"

Boston Summer Arts Weekend

Aaron Neville, "Ain't No Sunshine"

Bettye Lavette, "Crazy"

Emmylou Harris and Rodney Crowell, "The Traveling Kind"

To hear more from Brian O'Donovan, tune in to Boston Public Radio above.