Resonance - Reinforcement and intensification of sound by vibrations.
Sehr leise beginnend - Very soft in the beginning.
Texture - The term used to describe the way in which melodic lines are combined, either with or without accompaniment. Types include monophonic, homophonic, and polyphonic, or contrapuntal.
Al, all', alla, alle - To; used with other words, e.g. al Fine (to the end).
Bis - Repeated twice. Encore!