There are several musicians with this name, including:
1) Big Tom was Irish country music singer Tom McBride (18 September 1936 – 17 April 2018).
2) Big Tom is a techno musician.

1) Tom McBride (18 September 1936 – 17 April 2018), also known as Big Tom, was an Irish country music, Traditional Irish music and Easy Listening singer, guitarist, and saxophone player. Established in 1966, he featured as the frontman of the Irish showband Big Tom & The Mainliners. He was affectionally known as 'Ireland's king of country music'.

2) Big Tom is a techno musician. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.