What are two songs that can relate to Chains?

Two songs that can relate to Chains are songs that depicts the difficult condition of slavery.

Slavery is the backdrop for Chains.  Bob Marley's "Redemption Song" can relate to the experiences Isabel has as a slave.  Marley's song shows the sadness of slavery with lines like, "Old pirates, yes, they rob I;/ Sold I to the merchant ships."  Isabel experiences this reality with Madame Lockton. Isabel and her sister had no say as Madame Lockton took ownership of them. A great deal of Isabel's anger is that she feels Madame Lockton "robbed" her of her freedom.  While Marley's song relates to the anger and sadness of slaves, it also speaks to the resilience needed to counteract slavery.  Marley writes that slaves must "emancipate yourselves from mental slavery/ None but ourselves can free our minds."  This relates to how Isabel comes to terms with Madame Lockton's cruelty:

She cannot chain my soul. Yes, she could hurt me. She'd already done so...I would bleed, or not. Scar, or not. Live, or not. But she could not hurt my soul, not unless I gave it to her. 

While Isabel exists in "chains," she will be mentally free. She will not surrender her soul to Madame Lockton.  In refusing to yield to injustice, Isabel sings "a song of freedom" that invariably leads to her "redemption."

Slaves in Colonial America confronted a complex reality. Fighting for colonial freedom would not change their imprisoned condition.  Many African-Americans had to face a challenging set of conditions as they fought in the American Revolution.  They fought for someone else's freedom.  Isabel understands this when she hears Grandfather's words:

This is not our fight... British or American, that is not the choice. You must choose your own side, find your road through the valley of darkness that will lead you to the river Jordan.

His words carry more weight with Isabel when he says to her, "A scar is a sign of strength... the sign of a survivor." While enslaved African-Americans faced difficulty, words like Grandfather's showed how they fought for change.  A song that could relate to this struggle would be Sam Cooke's "A Change is Gonna Come."  Cooke wrote the song about the injustices African-Americans faced during the Civil Rights Movement.  The same connection can be made to slavery.  When Cooke sings that he knows, "A change gon' come, oh yes it will," it is reminiscent of how Grandfather urges his fellow slaves to search for their own "road through the valley of darkness,"  When slaves do this, a change will happen because they will find their "river Jordan."  Grandfather's words to Isabel about how scars represent strength and survival can be heard in Cooke's "There been times that I thought I couldn't last for long/ But now I think I'm able to carry on."  Cooke's song captures the spirit of hope and struggle that Grandfather's words communicate to Isabel and other slaves.