The Other Georgia
Created after Joel's return from [the country] Georgia in 2007, The Other Georgia is a professional vocal trio performing music primarily from the ancient polyphonic tradition of that country. The group performs regularly at Balkan Music festivals (NYC's Golden Festival, and Concord's Balkan night), has performed at the Summer Revels and at the Eurasian Arts Festival in the Catskills.
You can buy The Other Georgia's first album, Ancient Harmonies from a Distant Land, on either CDBaby.com or on iTunes.
Missionaries
In the fall of 2010, Joel was music director for the New England premiere of Elizabeth Swados' Missionaries, commemorating the deaths of missionaries killed while doing human rights advocacy in El Salvador. From the website:
On December 2, 1980, lay missioner Jean Donovan, Maryknoll sisters Ita Ford and Maura Clarke, and Ursuline sister Dorothy Kazel were murdered by a death squad for their work helping the poor of El Salvador and for their human rights advocacy, which were considered subversive activities during a brutal civil war that claimed an estimated 75,000 lives.
This year, on the 30th anniversary of their deaths, we invite you to remember their stories as well as the lives of other martyrs, including Father Rutilio Grande and Archbishop Oscar Romero, and the thousands of anonymous people who suffered persecution, torture, and death in El Salvador in the 1980's.
Missionaries by composer Elizabeth Swados is a haunting and beautiful folk oratorio based on the letters, journals, lives, and work of the four American church women killed in El Salvador. It was first produced at the Brooklyn Academy of Music after workshop at Vassar College in 1996, sung at the Church of St. Ignatius in New York in 2000, then staged in Cleveland, Ohio in 2004, and performed in concert at the Cathedral of St. John the Divine in 2005. The 2010 concert will be the work's New England premiere.
Click here for a link to the Boston Globe article
Click here to visit the Missionaries production website
Suffolk University Rhythm
Joel has been the music director for the Suffolk University group Rhythm since its inception in 2008. Fomerly known as the Suffolk University Vocal Ensemble, Joel oversaw its transformation from an under-registered "chorus" of 1 student at his hire to the fully attended, auditioned, high-quality pop/contemporoary music ensemble that it is now.
The Newton Family Singers
Joel has been the music director for the Newton Family Singers since its formation in February of 2010. From the website:
The Newton Family Singers is an intergenerational, family chorus ensemble based on the principle that "everyone can sing." Members of all ages and levels of experience are welcomed and valued, creating a diverse community that finds beauty and joy in the act of singing and performing together. The group draws upon a wide variety of folk and traditional music.
The Boston Merry Christmas Caroling Mob
The Caroling Mob is an annual mass caroling event open to all Boston area singers, amateur and professional. Sindelar founded the event in 2003 as the logical extension of his annual Christmas Caroling parties; it has grown from 30 singers that first year to over 85 participants in two different states. The main goal of the Caroling Mob is to build community and goodwill, while de-emphasizing the commercial aspects of the holidays. In 2006, the Mob was featured in the Boston Globe article A 'caroling mob' takes to city streets.
Click here for a link to the Boston Globe article
Click here to visit the Caroling Mob website
The Loose Canon Chorale
The Loose Canon Chorale is a small, quality-oriented chamber choir based in Jamaica Plain, Massachusetts. It has grown steadily from fourteen members at its founding in 2003, to 23 members in its last active season (2006), and has performed with a diverse array of artists: singer/songwriter Miss Tess, the Balmus Ensemble, guitarist and composer Ro'i Raz, singer/pianist/songwriter Dreea Pauta, guitarist Paul Ehrlich, belly dance company OmBellyCo., singer Wil Darcangelo, and flautist and conductor Orlando Cela.
In its 2005-2006 season, the Loose Canon performed in a Hurricane Katrina relief concert at the Capital Center for the Arts in Concord, NH, was hired to sing at Jamaica Plain's Christmas tree lighting ceremony, co-hosted a sold-out April Fool's Day show- at a Boston comedy club, and performed for the Cambridge Summer Revels, in front of the Boston Children's Museum.
The Loose Canon Chorale is currently on sabbatical as we work to incorporate as a 501(c)3 non-profit organizaion.
Click here for concert programs and mp3 recordings of the LCC 
Click here for a link to Jamaica Plain Bulletin article
Click here to visit the Loose Canon Chorale website
The Churchless Church Choir
The Churchless Choir was formed as an opportunity for non-churchgoers to sing as a spiritual activity on Sunday mornings. This harmony circle met weekly to sing folk songs from many ethnic and spiritual backgrounds. Joel started the group at Spontaneous Celebrations in the spring of 2004, and continued until the fall of 2006, when he took a sabbatical to co-found the heARTbeat Collective and make a musicological sojourn to the former Soviet republic of Georgia.