How can I shift the [U]tonic[/U] in a Major key to its relative minor key or vice versa as fast as possible when going into a new section. Is this technique used commonly in rock songs? Please if you have concrete examples that I could play to gain an understanding. I tried writing a song with section 1 in Bbm and shift to relative major Db in section 2 the tonic didn't shift; it remained Bbm, not Db or its 5th.

The reason why I'm asking is because I can write alot of cool sections but none of them go together. I'm having problems creating the 2nd and 3rd sections for all of these ideas I have. My songs take me months to finish and I need to speed this process up. The chorus and the bridge are the most difficult part especially the bridge.