Mainly since lyrics is an addition to the site and not a main part of the site to change the theme around.
Fatal error: Cannot redeclare sb_filter_arr() (previously declared in /HOME/wp-content/plugins/wp-songbook/inc/wpsongs-functions.php:4) in /HOME/wp-content/plugins/wp-songbook/inc/wpsongs-functions.php on line 4
I am having the same issue here, error is displayed on Song Main page becoming a blank page.
Thanks for providing some support,
