Being social beings we consciously or naturally are always sharing, developing and sustaining meaningful relationships with others.
This makes one feel authentic and valued, provides a sense of connectedness and belonging.
How often do then we forget to connect to ourselves? Bhajan is a way to connect to one's own self.
This song emphasizes Bhajan, the absence of the same can cause emotional imbalance.
And yes, Detachment is not, not being attached ever but it is being aware of the attachment.