Even if it may seem outdated and soooooo "classical" to you: There is a reason why most composers think in groups of 2, 4 or 8 bars when writing lines. A melodic arch consisting of an even number of measures, with two parts of the same length is pleasing to the listener. It allows you to let phrases flow. Because the listener hears a familiar form, s/he can concentrate on listening to the things that make your particular music special. Instead of focusing on the alienness of an unfamiliar structure, there is room for a deeper emotional connection. Of course there are situations where you will want to break that "rule", but in general try to stick to it.

Tags: bars, groups