Concert Development is another area in which Bertles has had much experience.  For nine years he been assisting the Carnegie Hall Link-Up program choose concert repertoire (including concerts for such orchestras as the Orchestra of St. Lukes and the American Composers' Orchestra) as well as collaborating with their conductors (Dennis Russell Davies, Rachel Worby, John Morris Russell).  He has created family concert programs for Caramoor Center for the Performing Arts, as well as concert programs in other musical forms (such as jazz, dixieland, zydeco, and salsa/merengue) for the Grammy in the Schools Concert Series.  He has also worked with such ensembles as the Brooklyn Academy of Music Philharmonia and the Vanguard Jazz Orchestra as well as with leaders such as Wynton Marsalis, Bobby Sanabria, Chris Washburne, and Justin DiCioccio.

Here are some areas in which he can bring his experience to bear:

• Help to select age-appropriate music concert program, what pieces, where to make cuts, etc.
• Choose composer-centered concert repertoire utilizing composers whose music, biographies, historical backgrounds and anecdotes excite and stimulate student interest
• Choose repertoire that is subject-based, such as music from a particular time-period or region, music that utilizes a certain form or structure, tells a story, etc.
• Brainstorm overall concept or theme for a single concert or a series of concerts, or for a sequence of interconnected lessons.  Such overarching concepts could be composer-based, concept-based or genre-based, as well as other possibilities
• Create concerts or series of concerts for family programming.  A typical example might include several elements, such as a mini-concert immediately followed by a workshop, and culminating with a final performance that includes not only the musicians, but the workshop participants and audience as well.