The orchestra ensemble consists of a number of sections, similar to the make up of a classic symphony orchestra.
First Accordion - The majority of orchestral melodies are played by this section allowing the accordionist to show the diversity of the instrument. You could liken this to the string section of a symphony orchestra.
Second Accordion - This section is the counter melody part to First Accordions, producing a balanced sound equivalent to an orchestral woodwind section.
Third Accordion - A very important part, providing a lower sound which runs parallel to the first and second accordions. This gives the melody depth in tone colour, using a deeper couple register for a fuller sound. This section is similar to a Symphony orchestra brass section.
Fourth Accordion - You can't have an ensemble without a rhythm section so here we have the part that defines the consistency of the tempo loads of chords and some occasional melodies to add sound colour.
Bass - Along with the fourth accordion, the bass is the backbone of the orchestra, with a good bass line helps to create a balanced sound and ensure a consistent rhythm.
Percussion - Works in collaboration with the fourth accordion and bass to provide a strong rhythm section for the orchestra.