Currently it seems that it is impossible to specify the header ID, automatically generated with the header text.
It'll be so grate if I can name the header ID not depending on the header text.
For example:
====== Supercalifragilisticexpialidocious [#song1] ======
↓
<h1 class="sectionedit1 page-header" id="song1">Supercalifragilisticexpialidocious</h1>
Then it can be linked with more simple ID: [[#song1]] instead of [[#supercalifragilisticexpialidocious]]