Question: What position did both Andy Bell and Judith Durham hold in their music groups?

Context paragraphs:
Judith Durham and The Hottest Band in Town: Judith Durham and The Hottest Band in Town is the fourth studio album from Australian recording artist Judith Durham.

Australia's Own Judith Durham: Australia's Own Judith Durham is a compilation album released in Australia in 1971 by Australian recording artist Judith Durham.

Colours of My Life: Colours of My Life is a 2011 compilation album by Australian recording artist Judith Durham.  The album was released in November 2011.  A DVD was also included featuring an interview with Judith Durham by Peter Thompson.

Here Am I (Judith Durham album): Here Am I is the first international compilation album by Australian recording artist Judith Durham.  The album contains tracks from Durham's two studio album, "Gift of Song" and "Climb Ev'ry Mountain" both on A&M Records.  The album was released in October 1972 and was the final release of Durham's on that label.

Let Me Find Love: Let Me Find Love is the sixth studio album by Australian recording artist Judith Durham.  The album was released in Australia in April 1994 and peaked at number 8 on the ARIA Charts in its second week.  The album was released in the United Kingdom in October 1994.  It was Durham's first studio album since "Judith Durham and The Hottest Band in Town Volume 2" in 1974.

For Christmas with Love: For Christmas with Love is a 1968 Christmas album by Australian recording artist Judith Durham.  It was her first solo studio album after leaving The Seekers in July 1968.  the album was recorded in Hollywood and Judith headlined her own concert tours across New Zealand and Australia.

Judith Durham: Judith Mavis Durham (born Judith Mavis Cock; 3 July 1943) is an Australian singer and musician who became the lead singer for the Australian popular folk music group The Seekers in 1963.  The group subsequently became the first Australian pop music group to achieve major chart and sales success in the United Kingdom and the United States, and have sold over 50 million records worldwide.  Durham left the group in mid-1968 to pursue her solo career.  In 1993, Durham began to make sporadic recordings and performances with The Seekers, though she remains primarily a solo performer.

The Golden Jubilee Album: The Golden Jubilee Album is a compilation album by Australian band The Seekers.  The album was released in November 2012, to celebrate 50 years since Judith Durham started her new job at an advertising agency in Melbourne and met account executive Athol Guy.  Guy invited Durham to sit in with his mates Keith Potger and Bruce Woodley and perform in a little Melbourne coffee lounge called 'Treble Clef' on 3 December 1962.  The quartet became known as The Seekers and released their first studio album in 1963, titled "Introducing the Seekers".

Andy Bell (singer): Andrew Ivan "Andy" Bell (born 25 April 1964) is the lead singer of the English synth-pop duo Erasure.  His solo career includes the albums "Non-Stop", "Electric Blue" and "iPop".

Live in London (Judith Durham album): Live in London is a 2014 live album by Australian recording artist Judith Durham.  The album was recorded in London in 2003 to celebrate Durham's 60th birthday.  The album released on CD and digitally in October 2014.

Supporting paragraphs: Andy Bell (singer) Judith Durham
Answer: lead singer