Someone chimed in at this point to note that the only way to get a tune out of a piano accordion was to squeeze it - which was perhaps a metaphor too far for some relationships. You have to keep squeezing it to make it work and it really needs wing mirrors mounted on the sides so you can see what your hands are doing.
By way of contrast the harmonica relationship is smaller but limited by the fact it requires the player to both suck and blow to get anything out if it.
Of course, the matter of the eternal triangle was brought up as this often plays a part in the orchestration of a marriage. The "tingle tangle" of the triangle was deemed a solo instrument and very difficult for three people to play at once and no one could recall the last time they had heard of a successful triangle trio.
It was felt that a relationship that played like a banjo would not be subtle and discreet but loud and bright with a complete lack of sustain. In musical terms, the banjo is, along with the accordion, an instrument people either like or loath. Paired together, some would regard any combination of banjo and accordion as a diabolic mix that can only lead to some kind of hillbilly family feud.
If a relationship was described as a tuba, all "oompah oompah" in bass notes then it may mean it is one in which the couple march to the same tune even though it may be leading them to a battle.
The bagpipe relationship would already be on the battlefield with friends and family retreating to get as far away as possible as it can be intimidating when standing too close.
Is your relationship a piano? The piano relationship with its mechanical workings hidden away means that sometimes when you lift the lid you discover there is a lot going on out of sight. They are big, heavy and hard to move, and when you do shift them they immediately go out of tune.
If your relationship seems to be more of a ukulele - small, easy to carry and simple to play - then this will provide some compensation for its complete lack of acceptance as an actual musical instrument.
-Terry Sarten is a musician, writer, husband, father and grandfather - feedback: tgs@inspire.net.nz.