Sonatina Symphonic Orchestra is a free orchestral sample library. While not as advanced or ambitious in scope as commercial offerings, SSO contains all the basic building blocks for creating real virtual orchestrations. It's primarily aimed at beginners, but also more experienced composers looking for something lightweight and/or portable might find it useful.

EDITED: Now the note range goes from C3 to C7 Originally I heard the choir soundfont in this video and wanted it, but couldn't find it anywhere. This soundfont is something that I found (with no sign of author or any metadata) in a forum thread with a collection of orchestral sounds and edited it to create a similar sound of voices swelling in volume. You'll find voice aahs and oohs, a mix of both slow and immediate attack versions of the sounds. See the demo included be...

Mellotron sf2 soundfonts: MKII Flute TapeKlik M400 Woodwind MKII 3 Violins MKII Brass M400 Cello M400 Cmb Choir M400 String Section Gc Brass, Gong M300A Violins M300B Violin Default_Set