Estrem later studied classical guitar with Jeffrey Van in St. Paul, MN, and taught classical guitar at Macalester College, Augsburg College, and Hamline University in Minneapolis/St. Paul, MN. His affection for classical, jazz, world, popular, blues, and early music has made his performances somewhat difficult to classify. Rather than remain strictly within one genre he prefers to perform and arrange pieces from a variety of sources. He keeps an ever-changing repertoire on 8 and 6-string classical guitars, 7 and 6-string acoustic guitars, 7- string jazz guitar, electric bass, 8-course renaissance lute, tenor ukulele, sarod and bouzouki.

Estrem is best known for his recorded guitar duet work with John Holmquist. Their first LP recording, Music of Edvard Grieg (on the Cavata label) consists of Estrem's transcriptions of 11 Lyric Pieces and the Holberg Suite, published by Music of the Americas. He was the arranger and producer of 5 CDs of jazz standards recorded with Holmquist on the Projazz label which were distributed internationally. The duo concertized extensively for many years and performed on NPR's "St. Paul Sunday" program, a nationwide broadcast. They had the opportunity to play for Segovia while the maestro dined at a private home after giving a concert. He seemed unfamiliar with the duet repertoire and kept requesting more music (as he consumed his steak).

In 1978 Estrem graduated from the University of Minnesota Dental School and the evening of graduation gave a solo concert at Macalester College. The concert hall date had to be reserved 9 months in advance and the Dental School only announced its graduation day 6 months in advance. Although the over-scheduled day was somewhat of a coincidence, a friend commented that this was a sign that music would continue to be a passionate force for many years to come.

Estrem says, "listening to good music is fine, and can be very moving, but I love to play it. The musical vibrations going through my body somehow make me feel better and more alive. It's especially magical when a musician is able to get into that "zone" where technique simply flows and time is suspended. There was a now-defunct music store in the Twin Cities that had as its motto, If you really Love music ---Play It. Of course, they had an ulterior motive, but I always liked that phrase. I love intimate music....solos, duets, trios or quartets. It's possible to get a good look into the soul of the artist with a small ensemble. There is no language like music when it comes to expressing emotions."

One of Daniel's previous releases on Magnatune was "Edvard Grieg" a re-release of a recording made in 1980. On it Daniel collaborates with John Holmquist, together they performed as a duo until 1988. John won first prize at the Guitar 78 International Competition in Toronto and a Solo Recitalist Fellowship from the National Endowment for the Arts. He has toured extensively and recorded several outstanding solo CDs. He was the head of the guitar department at the Wisconsin Conservatory of Music in Milwaukee as well as the head of the guitar programme at the Cleveland Institute of Music.

On Daniel's album "Preludes and Fugues of Jeremiah Lawson vol 1", Daniel plays the works of Jeremiah Lawson, (b 1974) a guitarist and composer living in the Seattle area. He received a B.A. in journalism from Seattle Pacific University in 1997 where he studied guitar with Hilary Field and composition with Eric Hanson.

Bach Cello Suites on 8 String Guitar

Bach Cello Suites on 8 String Guitar volume 2

Bach Harpsichord Suites on Guitar

Bach Keyboard Works on Guitar

JS Bach on Solo Mandola

JS Bach Trios on Guitar

JS Bach on Solo Ukulele

JS Bach on 8 string guitar, vol 1

JS Bach on 8 string guitar, vol 2

JS Bach on Guitar and Ukulele

Baroque Concertos on 8 String Guitar

William Byrd for Guitar

Cimarosa on Guitar

The Classical Period on Ukulele and Guitar

Classical Ukulele

Classical Ukulele Volume 2

Collage

Debussy on Guitar and Ukulele

Dowland on 8 String Guitar

Edvard Grieg

Estrem plays Lawson

The Four Seasons - Vivaldi on Guitar and Ukulele

Handel on Guitar Volume 1

Handel on Guitar Volume 3

Handel on Guitar Volume 2

Haydn Trios on Guitar

Jeremiah Lawson Vol 2 Preludes and Fugues

JS Bach on Solo Mandola Volume 2

Music of Fernando Sor

Jeremiah Lawson Vol 1 Preludes and Fugues

Ravel on Guitar and Ukulele

Reicha Fugues on Guitar

Reverie

Scarlatti on Guitar and Ukulele

JS Bach on Solo Ukulele Volume 2

Colors of Spain

Colors of Spain Volume 2

Telemann on Guitar

Telemann Trios on Guitar

Vivaldi Concertos on 8-string guitar