So, I finally managed to record the new song I promised here. The video is here:

I figured I might try going a bit into detail, in case anyone’s interested – I’m not sure, why they should be, but who knows 🙂

The title Bananifold is a stupid math joke I like that started here – it was kicked off by the quote

Classification of mathematical problems as linear and nonlinear is like classification of the Universe as bananas and non-bananas

which was followed by

Let a bananifold be an object that locally resembles a banana.

A Manifold is a subset of a vector space, that (more or less) locally resembles a lower-dimensional vector space. A beautiful example is the surface of a sphere: Obviously, a sphere is a three dimensional object, but if you zoom in enough, the surface looks sufficiently two dimensional that we can e.g. draw maps of parts of it. Any map of the whole earth is always inadequate in some way (which is why there are so many different ways to map the whole globe – each trading accuracy in some aspect for inaccuracy in some other one), but if you just look at e.g. a single city, you can draw a map that is sufficiently accurate that it’s difficult (if not impossible) to see, that it’s not actually flat – the curvature doesn’t matter anymore.

This is of course only an analogy – the actual definition is given via homeomorphisms (“maps”) on neighborhoods (“local areas”).

The song kicks off with the chorus, which is in 10/4 and based on the chord progression Cm – Bb – Am – Ab – Gm. Here’s the guitar riff for it:

The guitar tuning is: G - D - G - C - F - A - D

The guitar tuning is: G – D – G – C – F – A – D

The verse (in 7/4) is kicked off (and continuously accompanied by) the following clean guitar part. The “melody” notes are emphasized, since those will show up later again:

bananifold clean1

It starts off in Gm, but as soon as the lead guitar enters, the primary chord is an Ebj7. This is to emphasize the Lydian scale as the primary mode (I love Lydian – it’s a major scale, but it doesn’t sound as trivially happy as the “normal” major scale), shortly switching back to Gm, which basically serves as a subdominant, following an AABA structure:

bananifold verse

The tapping part of the verse is in G major:

bananifold tapping

The bridge / solo section starts of with the clean guitar playing this:bananifold clean 2

Note, how the upper notes are the exact same melody as the emphasized notes in the previous clean part, but this time played straight in 4/4. However, the rhythm guitar is playing an 11/8 over it, which runs through the solo section:

bananifold 118

I’m generally a big fan of polyrhythms, and this one might be one of my better ones… The chords (Gm – Cm) during the solo change with the 11/8, thus emphasizing the rhythm guitar, whereas the drums and clean guitar stay in 4/4, which still yields a classic rock-feel (with an additional 2/4 after every five bars to resolve properly – 5\cdot\frac{4}{4} + \frac{2}{4}=\frac{22}{4}=4\cdot\frac{11}{8}) – it should “fit” well enough not to sound too chaotic, but also doesn’t sound too predictable. I hope that worked out 😉

Those are the most “interesting” (for a lack of a better word) parts of the song. The full tabs can be found here (gp5 format).