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The Hyannis Sound is an American a cappella group, consisting of 10 male vocalists from the United States. The group convene each summer on Cape Cod, Massachusetts in the greater New England area.

Founded in 1994, Hyannis Sound has received critical acclaim from the Recorded A Cappella Review Board, won the Contemporary A Cappella Society multiple times, and established itself as a staple of Cape Cod's music and social community.^[1]

During the global COVID-19 pandemic in 2020, Hyannis Sound went viral on the TikTok and quickly became one of the most followed vocal groups on the app. They have since partnered with brands like Nerds^[2] and were featured in Glamour magazine's You Sang My Song series featuring Alicia Keys^[3] after their cover of "Fallin'" achieved over 12 million views on TikTok.^[4]

Hyannis Sound was founded in 1994 by Townsend Belisle.^[5] Encouraged by the success of the Vineyard Sound,^{[NB 1]} which he founded and produced, Townsend decided to put together a similar group on Cape Cod. The group rented a house in Hyannis to live together. Starting small, the group made a name for itself by singing wherever possible. After years of performances, the group established itself as a notable entertainment group on the Cape.

Since its inception, the group has gained popularity and now holds four weekly concerts within areas extending from Falmouth to Chatham. The group is also established as a non-profit corporation in the Commonwealth of Massachusetts.

In 2020, the global COVID-19 pandemic threatened the continuity of the group as it became difficult for its members to meet. In the end, the nine members of Hyannis Sound 2020 quarantined together in their home in Cape Cod, and launched a virtual concert series.^[6] Over the summer the group achieved nearly 700,000 followers across Facebook, Instagram, and TikTok.

The Sound has recorded sixteen albums to date.^[7] Their first, Live, All-Natural A Cappella, was a recording of their final 1994 concert. This album was followed by Talk About It in 1996, On the Beach in 1999, 110 in 2001, Aged Ten Years and Cape Standard Time in 2003, Route 6 in 2005, Shirt, Tie, Khaki in 2007, On the Clock in 2009, High Tide in 2011, Over the Bridge in 2013, H2O in 2015, Boys of Summer in 2017, Always / Sometimes (2019), and Detour (2021). Back to Back (2023) caps off the collection, containing songs performed by the group in the summers of 2021 and 2022. In 2003, the group also began a practice of releasing an annual Bootleg, a live CD every year with all of the summer's repertoire (recorded mid-summer from one show and released later in the year).

Hyannis Sound has performed the National Anthem at Fenway Park, at various Cape Cod League games, and have been featured in publications including The Boston Globe, Glamour, Cape Cod Magazine, Cape Cod Times, and Martha Stewart Weddings.

On August 1, 2020, in the wake of the COVID-19 pandemic, political strife, and rising racial tensions across the U.S, Hyannis Sound released a recording and video of "O-o-h Child" by the Five Stairsteps featuring over 60 alumni, including members from the group's founding iteration.

The ten-man lineup is selected annually. The group hosts auditions in Boston every spring and new members are chosen from an international pool of over 100 auditions. The audition process is weekend-long and candidates were judged on both their personality/character and musicality/performance. Most of the applicants have had experience with one of thousands of college or university a cappella groups throughout the country.^{[NB 2]} After passing the audition, new members are put through a rigorous orientation of long rehearsals and are welcomed by alumni before embarking on their summer performance schedule.

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• Official website