If you want Ustad Harjinder Singh Lallie's contact details I can send you them...The naamdharis also teach at the Naamdhari gurdwara on Cov Road (Birmingham)... You also have the option of making a trip to London and learning from Ustad Surjit Singh Naamdhari.
Traditionally mahapurshs used to set up vidyala's for teaching gurmat sangeet, however recent trends of sants starting schools and colleges for sansaari studies is just one of many reason that gurmat sangeet has been hit so bad. Obviously there are many reasons for the decline but a good example is the dommeeli taksal... Sant baba Jwala Singh Harkowal, Sant Baba Bhag Singh Jabbar wali and Sant Baba Dalip Singh gave sant Sarvan Singh the asheervaad to start the taksal in Dommeeli. But most of the taksals no longer exist.
Shaheediyan has given really good advice... thanks for that.
Most poeple are only out to justify their own action... for mashoori they question traditional seena baseena compositions and traditions in gurmat sangeet... Maharaj kirpa kari we stop stooping to these levels for mashoori. In a perfect world we would recognise everyones hard work and contribution rather than making unjustified comments.
You can buy the following books from India:
Sur Simran Sangeet (7 Volumes) Sant Sarvan Singh Gandharv - (republished by Sant Pritam Singh)
Gurbani Sangeet Pracheen Reet Ratnavali (2 Volumes) Bhai Avtar & Gurcharan Singh
Gurbani Sangeet Gian Singh (Abbotabad) (2 volumes) published SGPC
Sangeet Sagar Ragi Jaswant Singh Tibar Publisher Damdami Taksal
Guru Gobind Singh Rag Ratnavali Prof. Tara Singh
Partal Gaiki Prof. Tara Singh (Out of print)
Guru Angad Dev Rag Ratnavali - Prof. Tara Singh (Out of print)
Bhagat Raag Ratnavali - Prof. Tara Singh (out of print)
Sri Guru Granth Sahib Rag Ratnavali Prof. Tara Singh Publisher Punjabi University, Patiala
Sangeet Sikhya Gavo Saachi Bani Raghbir Singh Publisher Arsi Publishers, Chandni Chowk, New Delhi
Gurmat Sangeet Sagar (4 Volumes) Principle Dyal Singh
Gurmat Sangeet Sikhya Principle Dyal Singh
Tabla Mridang Sagar - Principle Dyal Singh
Ishar Sangeet sagar Ustad Sham Singh Publisher Chattar Singh Jiwan Singh, Amritsar
Gurmat Sangeet Charan Singh Ji
Guru Tegh Bahadur Rag Ratnavali Prof. Tara Singh Publisher Punjabi University, Patiala
Guru Arjan Dev Rag Ratnavali - Prof. Tara Singh Publisher Punjabi University, Patiala
Guru Ramdas Rag Ratnavali - Prof. Tara Singh Publisher Punjabi University, Patiala (ive heard this has been republished)
Indian Classical Music GS Mansukhani
Gyan Bandshavli Dr. Gurnam Singh Publisher Punjabi University, Patiala
Vismad Naad (Gurmat Sangeet Vishesh Ank) Gurudwara Jawadi Taksal, Ludhiana
Swar Samund (Jeevani of Bhai Samund Singh) Professor Paramjot Singh, Guru Gobind Singh Study Circle, Ludhiana (Difficult to find)
Sahaj Dhun - Professor Paramjot Singh, Guru Gobind Singh Study Circle (Difficult to find)
Saral Kirtan Parnali (2 Volumes) Joginder Singh Saral
Guru Nanak Sangeet Padhati Granth ( - Gurudwara Jawadi Taksal, Ludhiana
Gurbani Sangeet Darpan Prof. Kartar Singh Published by SGPC
Guru Angad Dev jee Sangeet Darpan - Prof Kartar Singh - Published by SGPC - (you can only get this from SGPC shops)
Gurmat Sangeet Sagar Asa Di Vaar Tey Shabad - Principle Dyal Singh
Gurmat Sangeet Prabandh Tey Pasar dr. Gurnam Singh, Punjabi University, Patiala
Sikh musicology - dr. Gurnam Singh
Gurmat Sangeet da vilakanata - Dr Jasbir Kaur
There is also a book written by Bhai Vir Singh which is out of print.
Bhai Kahan Singh Nabha in Mahan Kosh also gives abit of discussion on Raags... I might have missed some books out, ill have alook again later.
Principle Dyal Singh and Prof Kartar Singh have some good compositions in difficult taals, they also have compositions of Giani Gian Singh Almast and Bhai Samund Singh jee... Principle Dyal Singh teaches at Rakab Ganj Delhi and Prof Kartar Singh has the Anandpur Academy... both teach tanti saaz.