茱莉亚415古乐团是茱莉亚学院古乐演奏系的大型乐团，乐团的名字源自西方古典音乐巴洛克时期常用的音高标准A=415赫兹。自2009年成立以来，乐团在美国纽约市及国际舞台上广受赞誉。

茱莉亚415古乐团在2018年于玻利维亚奇基托斯音乐节完成南美首演后，乐团成员于2022年和2024年再次受邀回到该音乐节。乐团与耶鲁大学合唱团合作进行了多次国际巡演，并于2024年在英国和苏格兰地区演出了巴赫的《B小调弥撒》。乐团与茱莉亚学院马库斯声乐艺术学院合作，呈现了拉莫的歌剧《希波吕托斯与阿瑞西》以及罕有上演的路易吉·罗西歌剧《奥菲欧》，颇受好评。后者被《纽约时报》评为2021年度十大古典音乐演出之一。茱莉亚415古乐团还曾亮相波士顿、布鲁日和乌得勒支早期音乐节，以及莱比锡巴赫音乐节等。

茱莉亚学院古乐演奏两年制研究生项目结合了高水平的演奏训练和严格的学术课程，包含即兴演奏学习、表演实践、巴洛克音乐理论与听音训练、历史舞蹈以及数字低音等课程。学生还会学习创建和管理乐团实务，并学习如何有效地与观众沟通。他们通过茱莉亚学院的社区外展项目，将他们的技能分享给茱莉亚音乐推广计划和茱莉亚斯芬克斯表演学院的年轻成员们，向年轻的音乐学生和更广泛的社区介绍历史表演的理念。

古乐演奏系的毕业生已加入世界上一些最著名的古乐团，包括Les Arts Florissants（首席小提琴）、Il Pomo d’Oro（首席小提琴）、Seattle Baroque（首席小提琴）、Tafelmusik（首席大提琴）、Boston Baroque（首席大提琴）、Philharmonia Baroque（首席小提琴）、The English Concert、Bach Collegium Japan、Handel and Haydn Society、Boston Early Music Festival和纽约的Trinity Baroque Orchestra。

Juilliard415, the large ensemble of Juilliard’s Historical Performance department, takes its name from the pitch commonly associated with the performance of baroque music (A=415). The ensemble has performed to high acclaim in New York City and beyond since its founding in 2009.

After making their South American debut in the 2018 Festival Misiones de Chiquitos, Bolivia, members of Juilliard415 were invited to return in 2022 and 2024. With regular choral collaborator Yale Schola Cantorum, Juilliard415 has undertaken many international tours, and performed Bach’s Mass in B minor in England and Scotland in 2024. In partnership with their colleagues from Juilliard’s Marcus Institute for Vocal Arts, they mounted a fully staged production of Rameau’s Hippolyte et Aricie and a much-praised production of Luigi Rossi’s rarely performed opera L’Orfeo, named by the NY Times as one of the top 10 classical music performances of 2021. They have also made notable appearances at the Bsoton Early Music Festival, Leipzig Bachfest, MA Festival (Bruges), and Utrecht Early Music Festival.

Students in the Juilliard Historical Performance two-year graduate program combine high-level performance training with rigorous academic study, taking classes in improvisation, performance practice, Baroque theory and ear-training, historic dance, and continuo. They also learn how to create and manage their own ensembles, and to communicate effectively with their audiences. They share their skills with the young members of Juilliard’s Music Advancement Program and the Sphinx Performance Academy at Juilliard, introducing the idea of historical performance to music students in their teens, and to the wider community through Juilliard’s Community Engagement program.

Juilliard graduates have gone on to perform with many of the world’s most prominent historical-performance ensembles, including Les Arts Florissants (concertmaster), Il Pomo d’Oro (concertmaster), Seattle Baroque (concertmaster), Tafelmusik (principal cello), Boston Baroque (principal cello), Philharmonia Baroque (concertmaster), The English Concert, Bach Collegium Japan, Handel and Haydn Society, Boston Early Music Festival, and New York’s Trinity Baroque Orchestra.