The phrase "soporific dirge" carries a negative connotation and often describes something that is dull, monotonous, and boring. However, there are many other synonyms that can be used to describe something of this nature, including "tedious drone," "monotonous hum," and "dreary chant." Other synonyms include "lackluster melody," "dull tune," and "bland chorus." These words can be used to describe a variety of things including music, speeches, and even daily routines that may seem repetitive and uninspiring. However, it is important to note that while these synonyms may carry a negative connotation, they can also be used in a more positive way to describe soothing sounds or meditative practices.