The Flex-Ability series, arranged by Victor Lopez, fills the need for multi-level instrumentalists to play popular music together. Each instrument book includes 11 songs in four-part score form. The arrangements are carefully crafted to be educationally sound. Optional octaves and cue notes are included to allow for range flexibility.

The songs included are: Jingle Bells * Santa Claus Is Comin' to Town * Have Yourself a Merry Little Christmas * (I'm Gettin') Nuttin' for Christmas * Frosty the Snowman * I'll Be Home for Christmas * Angels We Have Heard on High * Joy to the World * We Wish You a Merry Christmas * Auld Lang Syne * Chanukah Medley: Chanukah/I Have a Little Dreydl