Power of Prophet Devorah's Song

From where do we learn that HaShem loves for Am Israel to sing to Him? The Torah begins with the word Bereshit בראשית and ends with the word Israel ישראל. The word Bereshit is divided into two words, "שיר תאב He craves a song", and the last word ישראל is divided into two words, "שיר אל Sing to God".

The Yalkut Shimoni says that singing Shirat Devorah HaNevia contains the power to erase all previous sins:

Judges, chapter 6, remez 60:
You find when a miracle was performed for Devorah and Barak, they said Shira (song).
From where do we learn that sins of Am Israel were forgiven? Rabbi Ibo says in the name of Rabbi Aba, z'l, that every place it says "ויוסיפו בני ישראל לעשות הרע And the children of Israel continued to do bad". But after Shirat Devorah it says, "ויעשו בני ישראל And the children of Israel did bad". From here we learn that it was the beginning of doing bad.
Where did all the sins from the past disappear? From here we learn that HKB'H forgave Am Israel for their past transgressions.

שופטים - פרק ו - רמז ס
וכן אתה מוצא בדבורה וברק שנעשה להם נס ואמרו שירה. ומנין שנמחלו עונותיהם, רבי איבו בשם רבי אבא בכל מקום הוא אומר ויוסיפו בני ישראל לעשות הרע, וכאן כתיב ויעשו בני ישראל תחלת עשייה והיכן הם מה שעשו לשעבר אלא מחל להם הקב"ה מה שעשו לשעבר

After my phone conversation with Ami, I was very excited for him but was unable to understand the sudden transformation from secular/traditional working man to a Ben Torah, sitting and learning Torah in a Kollel full time. Ami worked as a border security guard for over 8 years and had the dog for many years and suddenly, decided to throw it all away and learn Torah. It didn't make sense....

Until Merciful HaShem opened my eyes a little while ago to find the above Yalkut Shimoni to fully understand Ami's sudden transformation.

During our phone conversation, Ami said that he continues to say Shirat Devorah HaNevia daily. The Yalkut Shimoni says that saying Shirat Devorah HaNevia contains the power to erase all previous sins. THIS IS THE SOLID PROOF!!! Ami says Shirat Devorah HaNevia daily and its power erased all his sins, therefore, HKB'H merited him to sit in the Tent of the Torah and easily disconnect from all previous sins and impurities.

Devorah HaNevia is truly amazing!!!!

During her lifetime, before becoming a judge and prophetess, she helped Am Israel do Teshuva. 3,000 years later she is continuing helping Am Israel do Teshuva and teaching us how to bring Moshiach in Achishena.

Achishena - When Am Israel does teshuva, the redemption comes before its time and Am Israel will go out from the exile in a manner of good will and leaping, and will immediately ascend to the highest levels.