Think of a Bollywood legend think Amitabh Bachchan. His versatility and grandeur are enough to prove how he has redefined Bollywood in every era. Be it the early 1970s, when action was raw, the 1990s, when he channeled his bad boss energy, or the late 2000s, when he still remains unstoppable, it is safe to say the actor's middle name is relentless.

The Agneepath actor turns 81 today. What remains timeless, along with his incredible performances, are some of the superhit Bollywood songs sung by Amitabh Bachchan himself.

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On his birthday, let's take you through such classic melodies by Big B that have stood the test of time.

1. Mere Pass Aao: Mr. Natwarlal (1979)

Composed by Rajesh Roshan and with Anand Bakshi writing the lyrics, this was the first ever song voiced by Bachchan. It was a children's song that narrated a story in the form of a song. The actor's marvelous expressions stole the show.

2. Chal Mere Bhai: Naseeb (1981)

This was one of those songs that showcased brotherhood at its best. Rishi Kapoor and Amitabh Bachchan collaborated on Naseeb's song Chal Mere Bhai, in which the former requests that his drunk brother return home.

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Mohammed Rafi sang the part for Rishi, while Bakshi wrote, 'Chal mere bhai, chal chal mere bhai, tere haath jodta hoon, haath jodta hoon, tere paaon padta hoon, chal mere bhai.'

3. Mere Agne Mein: Laawaris (1981)

In the same year, Bachchan sang yet another superhit Bollywood song that still remains a cult classic. Mere Agne Mein was all about describing wives of different kinds. Be they tall, short, fair, or thin,

It was a hilarious take on marriage, as the actor appeared in drag costumes to entertain the masses. The music was given by Kayanji-Anandji, with a traditional tune taking the forefront.

4. Rang Barse: Silsila (1981)

It was a musical year for Amitabh Bachchan as he lend his voice to yet another timeless classic. Rang Barse, a North Indian dialect-dominated song, featured him, Rekha, Jaya Bachhan, and Sanjeev Kumar.

Did you know the lines from the song 'Rang barse bheege chunarwaali rang barse' were inspired by a bhajan?

5. Main Yahaan Tu Wahan: Baghban (2003)

Baghban witnessed the actor singing two superhit songs, Holi Khele Raghuveera and Main Yahaan Tu Wahan. The former, as the name suggests, is about celebrating the festival of colors.

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Main Yahaan Tu Wahan was an emotional ode in the form of a telephonic conversation with his on-screen wife, Hema Malini.

6. Ekla Cholo Re: Kahaani (2012)

The infamous Rabindranath Tagore song was sung by Bachchan with a montage of shots featuring Viday Balan. While he recited the major part, singers like Clinton Cerejo also sang the English bits of the song. Big B nailed the Bengali accent that added an authentic touch to it.

7. Tu Chal: Pink (2016)

A powerful motivational poem recited by the superstar, who also acted in Pink, took the internet by storm. Written by Tanveer Ghazi, the poem began with, "Tu khud ki khoj mein nikal, tu kisliye hataash hai, tu chal, tere wajood ki samay ko bhi talaash hai, samay ko bhi talaash hai."

Music director Shantanu Moitra used a soft piano with vocal aalaps. The end results will definitely give you goosebumps.

8. Badumbaal: 102 Not Out (2018)

Amitabh Bachchan played a 102-year-old father to a 75-year-old son (Rishi Kapoor). This song showcased the veteran actors in a fun element. Interestingly, along with singing, Big B even composed the tune of the song.

Radio City wishes Amitabh Bachchan a very happy birthday.